340 rear main seal leak/gush

I changed my rear main once with engine in car put in backwards even though I knew correct way. Was dry until I drove it then poured oil out all over the place. Luckily I didn't run it dry. So got to do the job all over again engine in car.

I could never get mine to be 100 percent dry until I put thin film of RTV between block and rear main cap. Otherwise pressurized oil from main oil feed would squeeze out and look like a rear main leak.