SkinnyG
Years ago when I had my 4AGE powerplant, I managed to pump 210hp by using TRD oversized piston 83mm (80 over), hi-compression 13:00 and TRD atlantic cam. I also got rid of the stupid weber in exchange of using the superbike 42mm x 4 keihin fcr flatslides carb. Nothing but good thing using the Japanese carb.
Here check it out.
http://mjmturbos.com/images/KEIHINSTERIOD.jpg