318 Oil Pan Gasket/Sealing techniques?

Next , is your pan leaking or your rear main seal? I haven't had a problem with the rear main seal before, but do now. Just duplicating what I have done in the past, and it's not working.
While I had the pan off, I replaced the rear main seal as well. The engine has a 1967 casting date on it and I don't think it has ever had the pan off of it. I'm replacing the timing cover gasket, front crankshaft seal and valve cover gaskets while I'm at it. Will likely do the intake manifold gaskets too. Engine is coated in oil everywhere. I got the pan cleaned up, painted and ready for reinstall. I pulled the trans out a few weeks ago to do a clutch and the bellhousing was coated on the inside with old oil and grease so that prompted me to fix all of the leaks before it goes back together. Don't want to ruin the new clutch.

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