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Which carb would be best for this application: sbc 355 w/Vortec heads, Comp Magnum 280H cam, .480/.480 w/230 dur @ 050, 1 5/8 headers, Air Gap intake, 2400 stall and full 2.5" exhaust. The car is a 71 Malibu and will be mostly street driven with an occasional burst. I had this motor in a 78 Malibu which I was running a Holley 650 dp with a ProForm main body in it. It was used mostly as a weekend drag car with very little street use. The engine may have 100 miles on it now.
These are my choices:
1 - existing Holley 650 dp and Air Gap intake
2 - Get new 600 Holley vac sec and Air Gap intake
3 - completely change my history with Holley and go to a Quadrajet with a regular Performer intake.

Your thoughts please.......Thank You
 

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1 - existing Holley 650 dp and Air Gap intake

"Leave the 650 dp on it"

theres rarely any serious gains Ive ever seen to swapping carbs from what you currently have on a combo like yours, it should do just fine if correctly tunned, altho you might want to try a few differant carb spacers under the carb, that at times helps marginally, Id try a 2" tall, four hole design personally IF you have the hood clearance, at $32 your not gambling much and it works at times


http://store.summitracing.com/partdetail.asp?autofilter=1&part=EDL-8713&N=700+115&autoview=sku
 
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