The engine itself is the same. The intake manifold is slightly different in that the carburetor base plate has coolant running through it. It also has a pcv type system instead of the road draft tube. It will work fine if you want to leave it that way. The only other issue you may have is the exhaust manifolds. They are different. You may have to reuse the 352 manifolds. As for the transmission the '64 has a vacuum modulator so you will have to run vacuum to it. Other than that they are the same. The '64 engine has an alternator instead of a generator so you will have to do some wiring if you are going to keep it which I recommend.