Competition Carburetion, Bob Oliver 775 331 5609 is who I use. He builds a very nice carburetor package but there are others such as BLP, Braswell etc.
I really don't know because I buy parts and build "custom only" versions for customers.Randy, I guess thats what I mean. Not to single one company or offend anyone, give me what you think are the top 2 or 3. I know there are many that will sell you an almost out of the box carb and really don't understand the actual mechanics of the carb and calibration from a to z. I can't afford trial and error on builders so give opinions everyone. I'm sure we'll here mostly on just a couple 2 or 3 companies for people wanting the best and most consistent builders. Most of you professional engine builders know first hand so lets hear it.
Glad to see Dave and others give their opinion.