318 vs 360 Rebuild...

True! The balance issue is when you move away from what the factory did. It will add costs going from external to internal.

The Magnum has a different external balance than the LA 360 external balance. The good news is B&M has a SFI flex plate that handles both engines.

I don’t know how big of a cam you want to run but Blue Print does offer 2 different cams with the engines. Go to Blue Print (.com) Has a good street cam and the other is about 10*’s more. For a nice street stripper that isn’t to danm big to drive around on.
Swapping out a cam is no biggie. Re sell the cam (the cam that comes in the BP engine) to off set costs if not simply break even. (Or better yet, profit!)

Oh, arthritis, yes I got it, I know it.