leaking oil pan, 360 Magnum

I used the magnum one piece gasket, cut the front portion off of it, and used the front portion from a regular LA Kit. Yes you have to buy two complete pan gasket sets but oh well. When you cut the magnum gasket make it so it does over lap with the LA front piece just a little but not too much that it is an interference fit. Use silicone where they meet, the install and let it set up thoroughly before use.

I think this site talks about it too: Magnum Swap -your source for Mopar engine swap information.