Try Ohio Crankshaft company for you parts, they make good stuff here in America up
I make my own kits using their crank and rods and either Ross or United Machine Icon forged pistons, AKA as KB, pistons up/If your wanting to build a motor with some power and want to rev it up regularly look for a 400 block instead of the 383 or 440 blocks, they both have real thin main webbing that will crack under medium to heavy duty use, the 400 blocks live a lot longer up

Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)