Wow.....thanks for all the quick replies (and feel free to keep'em coming).
275 will be plenty of tire for me....not going for redicuous power. I have access to a WRX rear diff and I hope it can stand up to my goals.
As far as the 2JZ fitment....as far as I can tell it SHOULD work without major firewall modification if I move the radiator to the front of the support like a couple other JZ swaps I;ve been involved with. Intercooler fitment and retaining AC could be tough then though. The factory crossmember could be a problem but that's what plasma cutters and welders are for
Until I secure a project vehicle and get it stripped it's all speculation at this point.