I don't know if clearance is an issue, I think there is space enough, the poly 318 is going to be build in in my 59 Dodge coronet, so I think that's an easy job. The generator is bolt on the cylinderhead, not on te exhaust manifold, so that must not be a problem. I use a cast iron 3spd torqueflite(with pb), I have no idea which manifold will clear the bellhousing....
I have some nos if you can furnish casting #s.Also have a cast iron cable operated trans that the seller told me was rebuilt and had come from a desoto. Don't remember the year. Casting #s would help here also i guess.