Best Method of Sealing Timing Cover/Oil Pan
I've used this Milodon crush proof oil pan gasket with great results.
http://www.summitracing.com/parts/mil-40600
However, I did the opposite. I put a light coat of RTV on one side of the gasket, stuck it to the pan, then put another light coat of RTV on the other side of gasket, and placed it on the block and tightened her up.
I plan to do my 318 like that either today or tomorrow, whenever that pan gasket comes...