i'd get rid of the rope seal and install a neoprene. TA also has a neoprene available for the timing cover.
i don't know that the Buick is different so far as cleaning goes. but if you're going to take it all apart, you probably want to inspect it too see if the oiling mods have been done. simplest is to procure the 5/8" ID oil pickup but there are also die grinding and drilling mods you can do.
many people like to relocate the oil pressure sender to the back of the block.
no Fram filters. use AC-Delco, Wix or Napa Gold or equivalent.
The way to crush the bourgeoisie is to grind them between the millstones of taxation and inflation.
Government schooling is about "the perfect organization of the hive."
H.H. Goddard, Human Efficiency (1920)