Frank, take that new 65 that you have and swap the crank out of it with one of the cranks you got from me. Then if you want the extra cooling put a 67 head and head button ( not an 80 head button) and that would give you a bad ass 65 engine. You don’t have to but if you swap the brass flywheel out it will rev faster but with the brass flywheel it will idle like a dream.