Just got a 65 Dodge Dart, my first mopar!
If you decide to swap in a V8, the center link in the steering linkage needs to be replaced with a V8 version.
I have a 65 Dart that was bastardized with some non stock stuff. I am reversing the mistakes and making it nice cruiser with stock parts from different years. 66 trunklid, 66 steering column and shift linkage, 67-later 904 trans and a 318 2 barrel.
Good luck and great score!