rear main oil leek advice

I have seen seal failures that were "immediate" where a piece of metal shaving got into the seal and ripped it but only once in my 63 years. Usually when a rear seal goes it does so gradually as the material wears out or is compacted by crankshaft wobble due to a bad rear main bearing. For a motor to be running well and then relatively suddenly develop a serious rear main leak leads me to believe that the oils is coming from somewhere else on the back of the engine. I have seen leaks from the soft plug at the end of the cam and a case or two where the builder did not tighten the plugs in the ends of the oil passages. One was bad enough where the plug actually came out and did serious damage to the rear of the block. See if you can borrow one of those cameras that you can stick up along the back of the block and see if there is oil up higher.

Larry