Been trying to build the 390 for my 68 cougar for a while now and keep running into problems with the rear most main bearing with the thrust surface. It doesnt seem to matter what bearing set I buy, none of them will fit over the journal. So far I've tried clevite part numbers ms683p and ms685p and q sealed power that I cannot remember the part #, and they are too narrow to go over the journal in the block and seat. They will fit on the cap without any issue (a little snug, but pressed on by hand. Anyone ever come across this? Any suggestions?