First off I have to ask...is it hard to drive that truck from the front fender...lol!
Okay for your question...I don't know. I guess the first place thing to look at is if the Magnum V8 mounts the same way as the old 318s did and if it's bolt pattern for the bell housing is the same. If so then one of the kits out there for putting the 318 into the M37 should make it easy for you. If it is different then you're going to have to make your own motor mounts and adapter plate. The only other suggestion I can think is let you finger do the walkin and google Magnum V8 to T-98 (or NP420) adapter. You might get lucky and find someone whose already made one. My gut feeling is you will have to make your own stuff.