318 Poly A engine in a 67 Cuda

273 said
Expensive gamble, depending on your skill set might be better off start from scratch.

Another guy suggested fox bodys are close. I'm going to order some exhaust manifold gaskets from this build and see how close they are. There may be a chance of only modifying at the engine with custom flange. 75 bucks on ebay for the header flange.