Hey Skylinegtrvspec,
First of all welcome to the family, I never knew you had an AE92 SR5. I have a 1990 SR%, if you'd care to see it, here's the
LINK
You probably don't know this and neither did I until a short while back. The SR5 and the GTS have alot more differences that skirts, spoiler, engine and interior..
In order to swap a 4AFE (SR5 & Sedan) engine with a 4AGE (GTS engine) you need to change the wiring harness, ECU (computer), transmission and suspension.
The front suspension setup on the SR5 and Sedan models are not the same whereas the GTS has a differen front sespension to balance out the extra weight on the car.
So it would probably be cheaper just to find a clean GTS