1 cylinder Wisconsin!
Sorry, just had to be different.
A 2.2L will add a bit a pep, but a 350 will light a fire under that truck for sure. There are a lot of posts here about parts and methods for the swap, plus on the main luvtruck.com site you'll find a how to for a V8 swap under info. As for the 2.2L, there has not been a lot of people doing it, so you'll find less info. I can guess that swapping another 4 cyl will involve a lot less fab work though. If you can, I would recommend you try to pick up an entire vehicle as the donor if you go that route. It is a lot easier to just go back to your donor if you realize you forgot to grab <insert part name here> and grab it than it is to try to track down some obscure bit of kit you need to make it run.
Definitely dig through past posts on the boards here though for good tips either way.