I had my quadrajets rebuilt in '08 by USA Carburetor http://www.carburetorusa.com/ in Collingswood. They did an very good job. I too have 454's and they ran a good bit better after the rebuild. You can drop them off or sent them UPS, I droped mine of on Monday afternoon and had them back Friday. They even gave me a new set of base gaskets. I think I paid $345.00 for 2 Q-jets.