Originally Posted by: JB 
Yep, they said a rope seal is all you can get now......
JB
I too thought that I had a bad rear main seal on my port 340 Chrysler engine. I was already to pull engine because of the oil in the bilge.

Before I did I got down close to the side of the engine were the oil filter bracket bolts to the engine and wiped the side of the engine all around the filter bracket with paper towels, Than I started up the engine and watched the area using a good light. Sure enough there was a slight oil leak around the gasket. I got a larger socket and rachet and tightened up the large center bolt, I tightened it about an 1/8 of inch. The oil problem was fixed.

That large center bolt was actually loose. It is worth a look if you havent tried it already.
Bill
"ALUMINATION"
1975 Marinette 37' Fly Bridge Sedan
Twin Chrysler 360 cu in - 250 hp
Grosse MI - FYC