New to the mopar world,Need help with 318 build..pleeasse..

Magnums are basically a head package they switch the rocker system to Chev type. The things that effect the swap is intake bolt holes are on a different angle most popular intakes have version for magnum engines. 5.9 are externally balanced like 360 just a different weight you'll need an aftermarket torque converter to work with a magnum and your tranny and last you can swap on the old belt system but gonna need electric fuel pump with either type unless you swap in a new cam.