Cam plug installed correctly?
Yep
Didja shellac the galley plugs?
Yes
Teflon tape/paste on the oil pressure tap fitting?
Yes but it's coming from the hole in the block saver plate.
Rear main installed correctly with the wiper on the crank side?
Yes.
Bell housing dialed in?
Yes
If it's leaking after the trans was installed, maybe something to do with that?