I bought a 1966 mustang and it currently has a Holley 450 CFM 4 bbl carb on it. The list number is 4548. I would like to buy a new metering block for it but I can not find one. If any one out there knows something that help me I would apricate it. I do not know what main jet size that I should use even if I find a new metering block. I have all ready replaced the power valve and all gaskets, it did help a little but not much. The throttle shaft is Ok, very little play. The timing is...

Carb. help ??? Best 4bbl carb. for a stock 289 V8 1966 Mustang.