Wow, your changing a lot more than i did.
YOu gotta change the distributor because, if memory serves me, the ignition coil for the celica is on the firewall and the ignition coil for the camry is in the distributor itself. Double check, its been awhile.
As for the oil pan, balancer and altenator. They may be a little different but they will all go in and work fine.
As ive said before, only thing i changed was intake manifold, valve cover, motor mounts, and distributor.
A little off topic, but you wouldnt happen to have a extra battery Tie down would ya?