Thanks for this input. I will check out what hole alignent I have. My eng. was built in 1983 and the heads were cast between 1980-1983. I was given a set of manifolds, but they aren't the rams horn type, but the kind that have the exhaust tail toward the rear of each manifold. I was told that rams horns are better because of the center draft, but if these were designed for this eng. woudn't it make sense that these are fine, or do they not fit into a '64 c10 w/o a lot of extra headaches?
