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

If you do stroke it, buy a complete kit from someone like scat with pistons, rings, crank, rods, bearings, etc. you can get em balanced and ready to drop in after a few checks with a mic. If not use what you have, 360 inches will make 300 hp falling off a stump. So you don’t “need” a 408 to meet your goals.