Ok, i rebuilt my 302 motor, the block says it's a 68, in my 69 mustang, and I used a 2 peice rubber seal, I filled the motor with oil, drove it around a lil bit and it's leaking quit a bit, i ignored it and took my car down and had the tranny rebuilt and got it back and the leak is still bad, i was talking to the owner of the local NAPPA and he was telling me since my crank has those cross slots were the rear main oil seal seals to it that i would have to use a old rope seal and he explained to me a few other things, i dropped the oil pan and took the rear main cap off and noticed there was a little pin in it that was used to hold the older rope type seals, well some guys from another forum were telling me I can take out that pin and just use a 2 peice rubber seal and it should work good but i'm worried about those cross slots in the crank wearing down the rubber seal and leaking again, can someone give me a really good explanation on what to do with this so it doesn't leak, I can't seem to find a rope seal from anywere in town, but i have a new 2 peice seal i can put in. i'd love a very detailed explanation on how to do one of these.