To 71350s point, I've owned a 427 for over twenty years. Actually my first build of the engine was in 1978 to true L88 specs. Recently, I paid for precision balance, and it still isnt as precise I 'd like ( which included zero-ing the pressure plate) ..... BUT.... I know Jonsey's balance with the flywheel I sent him, will even meet my "princess on a pea" standards. I am a princess with my rats! The first machine shop wasnt anywhere near up to my standards btw. I found the cam in -7 instead of +6.
I SHOULDNT HAVE TO CHECK WORK WHEN I PAY FOR PROS! But, many call themselves pros, and FAKE it , imho.
I had to do it bronze. Nothing amiss with my 427 , exe its on its 3rd, in my hands, rebuild. Runs great. 205 psi across all 8. But I want the additional 150 ft lbs, super critical machining and assembly, and total oil control of a pro built engine, so I await my final payment to our Mr. Jones..... AFTER he gets around to A/B'ing my 467 as a Qjet v Holley dyno mule. I spoke to Mark before he became a fixture here at TC, and have always coveted one of his BBCs. Its like ART to me. When he described his process, I heard my first boss ( and only) boss in the machining world talking.
And nothing against all y'all that choose to run 540 tall decks, its your ride! I hand built a 427 to eat 502s, and in street trim, my MJ467 would likely eat a 540 just fine. I like less doing more with less! I recall telling Mr. Brookshire when getting a cam directly from him, " honestly sir, I need to beat my bud's 509 Camaro and all those 502s with this lil rat!"
Its a 427L88 thing!
Good luck Bronze. Dont assume all are pros. We have a few "friends" here, Mark, Mike, Gary, Chris and Carl, among others , that truly are.
PS A local pro, whose "rep" Mark knows, wont put ovals on a rat. Carl McQuillen is where i got my " what?! is it for a wood truck? " comment. When talking about A/B'ing the tripower induction system, which we wont do at Marks, he recommended I take to Carl for a dyno session. Just so Carl can see ovals push 600 HP and 615 ft lbs out the door ( not with the tripower for sure, and likely not with a Qjet either).
ALSO, a local Chevelle bud blew his "pro built" 396 rolling easy from the NOCC show. When he told me who built it, and that he was going to take it back, I said NO WAY! Dont waste your time with those hack wannabees, call Mark. And Duke did. And now he can NOT fret about losing an engine when it drops a valve doing 60. Hell man, my garage built, but fastidiously checked mill took craploads of abuse, and still works mint.
And I sure as heck don't consider myself a pro. Only know enough to spot the real deal.