The engine seems to idle normal and doesn't seem to act up below 3k rpms, but once it's up there it completely bogs down and I can't seem to accelerate without switching gears. I'm not completely sure if this has anything to do with my issue, but I wrapped the turbo with a heat shield that may have covered the wastegate actuator arm. After removing the heat shield, the problem was still present.
Power loss after 3000 RPMs - 6G Celicas Forums
It turns out that it was simply beyond the point of needing a tune up. For some unknown reason my mechanic did not replace the spark plug wires, distributor cap, or rotor during my swap. I replaced all of those yesterday and now it's running better than ever.