Neither of the two tasks you intend on doing are straight forward swaps, and probably wouldn't be classified as "fairly easy".

Modern Magnum & Hemi motors (92 & newer) have different motor mounts and exhaust manifolds, the od transmissions are longer then the non od, and all after 88 or 89 run on computers.

There are plenty of swap threads here so I'm not going to rehash all that info. Look around and spend some time reading.
Gene