slant 6 / 318 swap

I recently bought a 63 Dart 4 door based on budget and condition of the car which was rather great for the money. This is basically my first mopar car as I have been driving a dodge mini-van for 11 years due to the need of the size of the vehicle. I've noticed on this site that not many 63 or 64s seem to be mentioned on here. Is there a preference for the newer models based on ease of swapping engines and other parts or is it just a style issue? I thought about the swap to a 318 but with all the work needed to modify the firewall and driveshafts and clearance issues, I wonder if I should have looked at a newer model mopar. I do like my 63 but a v8 and 4 speed would make it so much more fun to drive. I also DJ at local car shows in the summer so the 4 door has the room I need for equipment which is one reason for the 63 and the huge trunk it has along with the back doors to load stuff as needed. Again I was curious if people tended towards the newer models just because of ease of modifications.