i put the ram air exhaust manifolds on my 455 in my 68 firebird and the only issue i encountered was the oil filter mounting, I needed a special adapter to direct the oil filter away from the manifolds, i know the A bodies of 68 used a similar adapter as well but 67 might be an exception to that rule. Ram air restoration enterprises carries all the stuff you would need, bolt kits, adapters, and even gaskets that would help you through your conversion, plus they have prices on their reproduction manifolds which might give you an idea on the value of yours. good luck.
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