Racing Fuel Systems

I am slowly piecing a 520 big block together for my ice cream cruising chevelle. The plan is for a mildish build that will run for idle to 5500+/-. Because I want it to look stock under the hood I am sticking with a 4150. I have been looking at BLP unassembled kits and I have been looking at a new HP 950 Classic from Holley. I prefer the gold holley look.
I was told previously the new holley carbs have problems, is this still true?
I have never started from scratch with a carb so installing boosters in a 4150 etc is a bit daunting (can I have BLP install them for me?).

I did convert a 750 dominator to 1050 with a booster change and it runs very good so I am just a little ham fisted.

Thanks for any help you guys can give me.

John

Now that I looked at the BLP BLP BX4 BILLET BUILDER KITS you can have them install the boosters. Still not sure which way to go.

have them do it. they have the fixtures.

Would you go BLP unassembled vs a New HP Classic? What is the deal with Hp950s do they flow 950cfm? Do they flow less than 850s? Is the BLP 950cfm billet kit different than a HP950, the specs appear very similar for the 850 and 950.

sorry the HP 950 Classic is list number 0-80496-1. I am assuming I will be going with a 850 or 950 BLP unassembled kit. Is the 950 the same as holley's 950 with the 750 body and 850 baseplate?

Correct me if I'm wrong but I believe the holley 950 is a 1 3/8" venturi (750) with a 1 3/4" baseplate. I have read the 950 flow test was at 28" instead of the normal 20.4"water making it inflated advertising numbers. Can anyone comment on this. Not saying it's not a good carb though

I would recommend Woodruff Carburetor Specialist for a period correct looking carburetor that is live engine tested and may cost less than a BLP kit.

I did this earlier this year...

Mark, that is awesome. What body and boosters are those? That is likely overkill for a lower rpm BBC. We discussed you building me a carb once but I thought you pushed me to build my own. Probably because I am too poor and you were too busy.

My buddy that runs the chassis dyno hates vac sec because they always seem to have a lean sag/hessitation as the secondaries open that needs a big pump shot to cover. You apparently don't have this problem.

Gary Williams has a video for vacuum secondary on the street. He says it applies the power smoother on street tires, I think.