@hash4u
If you need ultimate power then instead of 4AGEs, try 3S-GTE or 1JZ-GTE, and if are stuck with 4AGEs then try 4A-GZE although engines avaliability may be very difficult but aforesaid engines are best engines...
4A-GE 4Throttle performance in front wheel drive cars is not exceptional ... Here in karachi there was an AE-100 with stock Silver Top but car usually beaten by other normal track cars like GTti and Starlet 2E-TE etc..
If you try to put this engine in a rear wheel then it will loose performance as compare to front wheel ...
You will be spending money ... I think go for some thing big that gives best results...