If you are not getting
oil to the top end of the motor it could be that your camshaft doesn't have the grooves on journals 2 and 4. these grooves are required on side oiler engines because they route
oil to the rocker shafts. The 390 and 428 blocks do not need these grooves because they have annular grooves cut in the bores where the cam bearings are pressed (quoted from "How to build max performance FE engines" by Barry Rabotnick, a need to read book.)