best machine shop/porter for 340 j heads

I agree with the other guys as well......You'll need a good converter if it's an auto..something in the 3400 - 3800 stall range and a Single palne intake and a 750 carb. You'd also be better off with say a Comp 294S cam as well (294/294 - .525/.525 w/110 CLA). Do you have to run on pump gas or can you run race gas? As for the heads....since you are in PA I'd defnietly send them to Ryan J @ Shadydell. Also after Ryan gets done with the heads I'd have him spec the cam to go with them that way it is all matched.