oil pan may not fit on the 65s i have used the milodon 57 chevy oil pan as it a shorter sump and will not hit on the streering as for your re cam its abit big for low cr 454 could work but the heads will need work to get it to work valve seals and gulds will need work around 550 things gets close with oem stuff and NO on the stock rotator you should use a eliminators