Realistic difference 340HP vs TTI early body headers 273

crackedback said
I would not spend the money on either the tti or a set of 68-70 340 manifolds.

If they will work, I'd buy a set of 71-74 340-360 manifolds and run it. You'll save a bunch of money! If the manifolds you are looking at are 71-74's for $400... RUN!!!!!

X2... with those cubes and that cam, the headers wouldn't offer much till just shift point.