BP 408 Oil Leak
For wondering minds, I encountered this myself years ago. Worked with OP, and much like an old engine of mine, gasket was replaced, and reinstalled with a small film of non hardening gasket maker. Fixed the leak up and all is well. He is good to go several weeks later. The bp408 is one of the few engines we do that still uses a seasoned block, so probably just a small imperfection on the plate or block. He's been driving it a few weeks and all is good!