What do you want to know? And where did you hear that "Supra drop in the 3sgte?" I know for the JGTC, the Supras all run the 3S-GTE because it's light-weight and smaller, providing better power-to-weight ratios and balance.
About the 3S-GTE:
http://www.toysport.com/ENGINE%20EVO...THE%203SGE.htm
http://www.mr2.com/TEXT/3S-GTE_Engine.html