What engine for my new Town Panel?

What year did they quit making the 318? 91? So 26 years old. I just assume I won't find one that is in good shape. I don't see many locally at least. I'm not really interested in doing a rebuild at this point if I can avoid it. I put the magnum on there, since it is somewhat newer. Whatever I put in here will be EFI. Carbs are just not reliable for the way I plan to use this vehicle.

I love the 318 though, I would throw one in with EFI if I can score one in good shape.
Technically the 318 went until 02 or 03 (5.2 magnum) simplicity wise I'd say 5.2/5.9 magnum would be your best bet but a 5.7 would offer better power and mpg but I too think a cummins would be the altimate swap.