you'll need to check your heads over good, they might have cracks between the valves, pretty common sadly. if you got high miles while the heads are off you can change the valve springs and seals too.
you will need new head bolts too, you can just use new tty bolts, run like 16 bucks, and you really should clean the head bolt treads in the block out with a thread chaser, or make your own out of a old bolt, cut 2 lines down the threads on opposite sides and run that bolt in and out of the holes. gets all the old thread locker out.
as long as the engines out, clean the piss out of it then take it apart.
get a lower conversion gasket kit, has all the gaskets for the block, front timing cover and seal, rear cover and seal oil pan oil filter housing and the pick up tube as well. as long as its out may as well make sure it dont leak right? kits like 35 bucks too, almost free at this point lol you also need new head gaskets, lim gaskets and upper plenum aka supercharger gaskets.
the oil pan bolts, put some thread sealant on the bolts on the sides, the threads can be the oil leak, you'll see how the threaded holes go into the block and oil can hit the bolt threads. i also ran a thin smear of rtv on the block and the pan to make sure it dont leak, smear = 1-2 mm thick.
