Man When It was time to replace my 22RE I was really amped to drop a few different engines in her. First and fore-most was the 1KZ-T 3.0l I4 Turbo Diesel, Then the 3RZ and I even toyed around with the idea of the 3.4... Now I like my 22RE, but quite often I find myself wishing I had just gone for it and put in one of those other motors...
Now I'm not saying you should put the 22RE in, but I do think that you should really really think aboutn how you use your truck and tehn choose between the 3RZ(2.7) and the 5VZE (3.4)... From what I understand, those who've done the 3.4 swap are getting better milage and ALOT more power compared to their old 3VZ. Personaly, I really think I might have missed the boat by not doing a swap. I love my 22RE for what it is, but boy would I like more power. Be careful though, you'll need to do a wiring harness swap as well if you plan to run a manual and are only finding Atuo-backed motors. ORS has you covered though and have stand alone units to make these engines work in front of the R151 Manual tranny.
Cheers
Dave