Im using a K1 3.79 crank, K1 6.125 rods and an off the shelf Diamond Forged Piston thats designed for a chebbie 383. The K1 crank has 2.1 chevy rod journals. The K1 rods have a .927 chevy pin. The 6.125 rod length was perfect for the pistons comp height. This nets me 387ci in a 360.