2014 hemi 5.7 replacing a 318 in a 1977 power wagon 4X4 ?

I just want to say thanks to everyone for all the good information. I didn't expect very many responses but apparently a lot of you have been interested in the generation 3 Hemi swap. I might eventually do this swap and will keep all the great information you all have given me, but I have some more questions.

I just run across a 2003 Hemi Ram 1500 that needs a motor. The engine currently in it still runs but has oil pump issues. If a new oil pump wont fix it, would it be worth installing the 2014 engine ? Seems like it would be almost a direct fit. Then I could rebuild the hemi in the 2003 ram and use that in the 1977 power wagon. Any thoughts ?