If you're doing an out of the frame major overhaul, it's also possible to machine the block for a full-circle lip seal that will positively eliminate rear main oil leaks. I believe the same seal that fits a Ford V8 Diesel works for the stovebolt engines.
Jerry

"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!