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Scott - I had exactly the same problem on my 351W stroker. Luckily I spotted the leak before I fitted the engine into the car (engine had run on builders dyno).
I used the four part gaskets, had plenty of fun getting the two rubber seals to stay in place. I used lots of white RTV on the "ends" of these seals, and especially on the sump around the rear main area.
Engine dribbled a little for the first 2000 miles, now dry. Maybe that RTV was the wrong type and has swollen up a little??
I think you should be able to tell if your leak is from the rear main seal or not by where it shows up. Mine came down the front face of the detachable steel cover plate which is in place over the very bottom portion of the bell housing. Thus I knew it was from the sump seal.
HTH
Wilf
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