Magical oil leak

I have an oil leak I have been battling.
Magnum block 5.9
408 blueprint short block.

At first it was a leak from the rear main. I have replaced the rear main seal twice. This last time I even installed a new oil pan and new gaskets since the other one didn't look to healthy. I have nipped all other oil leaks. Filter is dry, valve covers dry, distributor and oil gauge fittings are dry, intake manifold is dry. Only other problem I can figure is oil plugs in back of block leaking... is there anything I may have missed?
Thanks