So I decided to build a 360 for my Valiant :)

NC Engine Builder said
Checking and grinding the crank would be a few hundred, ballancing about the same. That job would be about 500-600 total in my shop.

Dartswinger70 said
I would for example have a 360 with trans bolted on ready to drop in in place of an internally balanced 273/318/ early 340 etc.

I would take a 360 get rid of the dished pistons and maybe a cam and that's it with maybe the J heads I think it would run

well...and the recipe is simple

And... the same recipe, pistons, cam , and j heads would also make a decent 318 and it is still a simple recipe.
Just don't tell it that its a 318, and it will run great.