Been there, done that! My first Mopar was a 63 270 Dart in 1968 that I swapped out the /6 for a 66 273. Luckily I bought a 66 Dart that was complete, but wrecked. I used as much of the 66 stuff as possible to do the swap. The reason being is that the 63 was never designed for any V8 and that...