I've already been through a NA-T Supra and a Supra TT with a 78 on it. I personally know very well what over 500 to the ground in a NA-T does, and what over 600 in a TT does. I also know that your Lexus wouldn't have a chance against my old foxbody, much less ZOSICK's current setup.
I'm not knocking your 2JZ - I like them as a powerplant, but unless you tub out your Lexus, you aren't going to get more traction than a Corvette. That may hurt your feelings, but it really shouldn't - both cars were built for different purposes.