magnum block/ LA questions

Thanks a lot guys. I'm fixing to order the Hughes eccentric bolt on piece. For the fuel pump. I'm trying to buy an air gap intake for the magnum setup now. So hopefully the heads check good. The heads are pulled and when I get to work Monday im going to mag particle test and dye penetrant test them. Also on the flex plate. I need a stock 5.9 magnum plate correct then remove the weight from the tc right. I think the only magnum plate I have laying around is a 5.2. Which if I remember right there different. Because the 360 is external balanced and the 318 is internal? I believe I'm right on that. Thanks again guys