'70 Dart 392 Project; what direction?

I had to go back and see what pan the OP is using. It appears the Holley pan utilizes those big bosses on the side of the block where the extra engine to trans bracket would locate. I'm guessing you'll find nothing that is a true bolt on because of that. I use the Milodon pans. You have to grind those big bosses down(as pictured in an earlier post) to get a mini style starter to fit.