You are going to need a high pressure fuel pump and maybe some sort of surge set-up. Old celicas had a low pressure mechanical to feed the carbs.
Not that I did the work myself on mine, but all the body wiring etc can be kept as is. Just put in the engine loom and join up the ignition circuit (including your new fuel pump setup which might need a relay for the greater power).
There are a few people on here who have used the J160 gearbox also and you may need to alter clutch lines as I think the J160 is opposite site to the T series box. J160 might mean the transmission tunnel needs kinetic reprofiling. Modifications to the gearbox crossmember and possibly cut the trans tunnel to let the gearstick into the cabin. Not sure what the speedo setup is either. You may need some kind of adaptation to allow the celica mechanical speedo work with the j160.
I'm not sure where the sump is on the 1G-FE but I think the ta23 crossmember is preferred by many of the 1GGTE conversion folks.
All of this will be lurking in the tech threads or the various members rides threads. Search function on the forum is not the most helpful, but you should find quite a bit of information nonetheless.
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