depends what your next step, easy way is to rebuild your 4afe & since your in california you'll be smog legal also.
or just like rip the e brake says swap a AE92 4age engine, harness & ecu, since you are in california you can make that smog legal by going to BAR and get a BAR sticker. if your thinking you'll get more power sure maybe if you get a healthy or rebuild 4age assuming its still holding a compression ratio of 9.4
or buy a front cut Japanese ae92 or ae101 4agze, 4age 20V silvertop or blacktop you'll have a very noticeable power but you wont be smog legal
http://www.venus-auto.com/inventory/...ine/toyota.htm
Or whats getting famous right now no yaris and scion people a 2zzge from a pontiac vibe or celica GTS w/ a 6 speed tranny, that you can also do a smog legal in caifornia.
if you want a japanese 2zzge w/ tranny you can get it here also but don't think it will be a california smog legal
http://www.venus-auto.com/inventory/...ine/toyota.htm