bye slant six, hello 318
The question of a 318 or 360 sometimes comes down to what presents itself.
My 66 got a bored 318 - why ? because it was given to me free, it had already been run for a while and was rebuilt - I checked it out carefully, everything was in spec and so I decided to freshen it up and use it.
My sons car will get another 318 when we pull his motor - why ? We got a perfectly good 318 for free that needs nothing but bearings and rings, we checked all the measurements on it too.
If I was given a 360 under the same circumstances I'd use it, just hasn't happened to me yet, guess I'm lucky or cursed with 318's ! LOL