Where is all common leak sources possible on a 65 904?

So if you google Pat Blais, he has every seal for the early style, I have rebuilt all of the same areas you speak of and still have leaks after time. I need to check the neutral safety switch that might be it.

Also check your cables for cracks fluid does get in the cable as well. The aft park cable is not to bad to do, Pat will talk you through it.

There is also a new pan gasket that is like black rubber with metal in it, you don't use sealant either, I may try one of those.