67 318 magnum swap

Hi all, I know it all has been covered and I dug through and found most of my answers, but I lost the post where I found it!

So, heres the run down. I have a 67 valiant im throwing together as a surprise.

I have a 94 318(5.2)/auto Dakota doner truck.

What oil pan/gasket do I use when putting it in the valiant? I need a center sump, but I think I read that the magnum motors use 360 style rear main?

Also, how come more people don't use the trans from the pick ups?

Im keeping it fuel injected and the wiring doesn't bother me. ive done many swaps in the past. Though this one is new.

Thank you all!