This is for a 4x4 and I know there are some very sharp guys in this subject question I have on here. Its not gonna be a race engine. Its gonna be a mild build to run on pump gas. I have a set of fuelie's going on it and should be around 9 to 9.3 to 1 comp. Cam is 220/[email protected] 507lift 111 lobe sep hyd roller. The question is rod length. 5.7 or 6 inch?? Thanks!!!