I don't recall any documented 1967 L72 cars in any model.
The Corvette went to the L71 tri carb engine in 1967.
Some say they remember 1967 Police 427 tri carb Impalas but not sure if they were 400hp or 435hp.
Even looking at Chevelle L78 production numbers, if I remember right, 1967 was really low
year at about 600...
...For some reason, it seems there was some type of cut back on SHP engines in 1967
Back in 1967 I was in Nurse Chev-Olds in Whitby Ontario. The salesman wanted me to order a 427 435 hp Biscayne coach. He claimed that it was the only way to get this engine in a full sized Chev. I have never heard of anyone having this combination ever. I don't even know where he got the idea that the car/engine combination could be ordered. The idea had to come from somewhere. In the late '60s Nurse used to be home to the UOP Shadow CanAm cars when they raced at Mosport. Nurse sold a red COPO Camaro in '69 so they were a little bit up on the performance world back then.
FWIW...I ordered my 1967 Chevelle SS 396 with the 375hp/396 option in Jan of 1967 based upon seeing it listed in the "new" NHRA classification guide we had received, did not get delivery until June of 1967, was worth the wait. NO 427 FACTORY CHEVELLES KNOWN TO HAVE BEEN PRODUCED.
I have an older farmer friend that was also a gearhead back in the day. He always had loads of Hot Rod, Car Craft, Popular Hot Rodding, and Super Stock magazines upstairs in his detached garage. In the late 1970s & early 80s used to pour through those old magazines. I learned about the full-size SS427 via the old Nickey Chevrolet ads. I believe it was a Super Stock magazine from 1969 that did the only known road test of an actual 1969 COPO Chevelle; just before that a classmate that I had sort of regarded as a bit of a BS'r bought a 69 COPO Chevelle (this is around 79/80) and I thought it was made up. When I saw the Super Stock article I changed my tune, as his Chevelle pretty much looked like the test car. I didn't know about GM Canada documentation at that time but I soon learned his car was GM Canada documented as a COPO (we are so lucky to have Vintage Vehicle Services in Canada.) See attachment for the 1979 Auto Trader ad he bought it from.
I get a chuckle out the the "fact" that 1000 were made in 1969 according to the ad above. Cars & B.S. together are nothing new. People love to invent facts. I'd rather rather quote Fran Preve from a 1992 published interview where his best estimate was 323 COPO Chevelles built in 1969 (Fran ran the Tonawanda Engine Plant in New York).
Regarding the L72 in the full size Chevy for '67, GM got very concerned about their public image after Nader's slanderous book. The L72 was dropped, along with the planned upcoming triple carbs. All cancelled, plus the 180-horse turbocharged Corvair was cancelled along with the 140-horse 4-carb version, the L78 was cancelled from Chevelles, the L79 was cancelled from Chevy IIs. GM had a lot of official attention on them and not the good kind. They even were caught spying on Nader. GM really had to play good corporate citizen. Meanwhile the rest of the auto industry kept upping the ante, so Chevrolet quietly reintroduced the L78 into Chevelles later in the 67 run, the L79 returned to the Chevy II very late in the 67 production with only 6 built. As far as the triple carbs on the full-sized Chevy, law enforcement alone was offered that option atop of the 427s. Remember that farmer friend with the old magazine collection? He had one magazine from 1968 that did a special on Police Interceptors. They published the specs for the 1968 Oldsmobile Delmont 88 B07 with a hot 455 (I seem to recall the W-34 400-horse Toronado engine in the car but who knows); plus actual excerpts from Chevrolet published promotional material for the 1968 Police Cars that clearly showed the triple carbed 427 as a special order option (in print!). Keith Tedford had told me about a dealer offering him a chance to order a 67 or 68 B07 Police Biscayne powered as such but Keith bought a dealer-swapped Pontiac 428-powered '68 Firebird from London Motor Products instead. He sold it later in '69 when his '69 COPO Chevelle came in.
So there were performance oriented COPO options in 1967. Besides the 435-horse triple carb 427 Biscayne, there was a COPO for the 4-carb 140-horse Corvair that had been dropped from regular production for '67. It was done for Don Yenko or for the Corvair Fitch Sprint (I can't remember which). By 1968 the 4-carb Corvair was once again a regular production option after a 1 year absence.