So I have a more recent version of the Toyota EPC now, and Japanese area version also. Some interesting things I can confirm:
There was a GT model in Japan with T series rear end and drum brakes. Avaliable both early and late, and with a LSD option. Axles are different for the LSD (a bit shorter), and late axles are different to early ones of course. Early GT rear end would be exactly the same a TE72.
The AE85 actualy has a K50 transmission, not the T50.
Early JDM interias are all maroon or blue, not black. Late model interia is mostly black.
Early GTV 3D did not have a rear wiper.
Power windows only on late model Apex, not early ones.
The JDM AE86 did not have a oil cooler. The oil cooler was only a option in Europe. The 20valve did not have a oil cooler either.
On the GTV you can see a small bit of carpet between the gear stick and the hand brake. Not a full centre console.