I think I finally fixed it. I piled up some JB into that corner on the underside of the manifold, let it set for a full day then filed it down nearly flush with the block mating surface. Then when reinstalling the manifold I put down extra-tall beads of Right Stuff on the front and back. Driven it a few times now with plenty of WOT revs to near redline and haven't seen a drop of oil in the usual areas, it used to pool on top of the timing cover and track down under the passenger side head then down the bellhousing and leak onto the ground.
Hopefully now I won't need to top up the oil every 500 miles and the engine will actually stay clean.
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