oiling up grades to 340 new and old ideals

For show and go with a roller cam? Bush the lifter bores, make sure the oil feeds from the cam journals to the mains are enlarged to 9/32 or 5/16s, make sure the filter plate has 8 holes or more, if you run the 90° adaptor you can clean up the edges as the posts above note, drill a couple extra drain back holes in the valley and debur the edges of the valley drains. Otherwise, make sure the clearances are in spec, run the HP spring in a std oil pump, and have fun. No reason to do much else.