What kind of carby? If its a Holley i'd take it to Mikes Dyno Tuning/308 Shop, if its a quady i'd take it to Mario at Autotechnique. Not sure how much.
mate if your gonna spend 3-400 on rebuilding a 15-20 year old quaddy, spend a bit extra and buy a brand new edelbrock. We bought one for my old mans ute and it was perfect straight out of the box, WOT was at 12.3afr's and cruise mode was at 14.8afr's. Even the idle has gone from a bit rough to very smooth.
ive got a Holly performance carby i wanna sell, 750cfm, its got about 4000kms on it, if that not to sure, its like new, it was on my old 355 engine (EAT30L) but now im rebuilding it and going bigger.... If anyone keen on buying it, give me a call on [phone removed]... Cheers