max line bore?

People only do that to the 400s when they want to go fast.
If God allows it.
I'm going to have a 360 crank cut down and put in a 318 with a 4-inch bore.
You ask why? Why would you put a 360 crank and pistons in a 318?
Because I want the markings for the 318 on the side of the block. But I want it to run better than a stock 318.

Not a damn thing wrong with that. You couldda just said "cause I want to" that's reason enough.