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you would need the head, a complete wiring harness, ecu, all the sensors. coilpacks, etc. its a pretty involved swap. would be easier to just find a celica gt complete engine ecu and harness. i would recommend arp head studs if you do this swap, because toyota uses torque to yield head/main bolts. aka torque once and throw away.
also, from what i have noticed with 1zz differences between the celica and corolla, the corolla has stronger rods, but worse pistons. the celica also looks to have slightly higher comp (10.5 vs 10.0). all the pics i have seen show a raised center section on the celica pistons. they also are coated pistons stock. the rods are cast on the celica, and powder forged metal on the corolla. i would rather have a slightly heavier forged rod, than a lighter cast one. just my opinion.
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