You can get a 4” stroke billet crankshaft from either Muldex or Bryant.
https://moldexcrankshaft.com
https://bryantracing.com
You use small block Chevy rods available from Oliver, Crower, Manley and others.
For my 427 I used a 4” stroke Bryant crank, 6” SBC Crower Maxilite 6” rods, and 4.125” pistons from Diamond.
Sent from my iPhone using
ZR-1 Net Registry