Hi Joe,
I'm not sure if the seal on your car is the same as my 53 engine, but here is my experience.
I made a little "funnel" that made the job possible. It is a pain in the butt in general, however rewarding when the engine does not drip.
My seal really fell apart, so it was a lot more than a drip.
My project blog P38 Page 38 and 39 were my trials and tribulations with the rear main seal.
I tried first with an "old original type seal", and had no luck. Then I tried with a modern graphite seal and it worked. I think the newer seal is more flexible, which makes it easier to snake into the block.
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