why not swap to a 22re or a newer tacoma 4cyl.
I would be rebuilding my 22r and putting on my Fuel Injection from a 22re that is pretty much really close to going on but I dont want to put it on yet since my motor is so turdish.
I am also now lookin at the 3rz because they actually are pretty cheap (relatively). Either way its going to cost a lot, take some time and put my truck out for a while which all 3 suck.