rear main seal install, cam plug, oil galley plug

for the rear main seal I grease the lip, scotch write the crank. and I use flange sealant its a rem jam like paste. at gm I used it for rear main sealcaps so it would leak out . I have a spare rear flange like that
and I use right stuff silicone to stick the rubber oil pan seal to oil pan and use that and bolt it to pan overnight so it stays in place . so if you don't have one I would do that first then assemble the rear main seal. and also use a bit of Silicone to seal the oil pan after.
as for the cam plug in the rear tomorrow will send you a picture and measure how deep it is in
I light sand the plug and use permeated forma gasket 80003 ( fast setting hard drying)1C
the oil gallery plug I use the pipe sealer paste on it.
the rear main seal and oil pan area is problematic for oil leaking , so take your time