Depending how much you want to spend, look into a Engnblder head, with the larger valves.
And don't look into turbos, not worth it. To setup a turbo motor right, you could do a 3RZ swap way cheaper, or have at least 2 fully rebuilt 22R's sitting on the floor waiting for you to blow the one your driving. I took out a 22RTE and out in a 22RE in my truck. It was gonna cost me 3X's as much to rebuilt the turbo motor, than it was for me to do a 22RE.
