Ah no worries for the RX7 there. The 2JZ still sits quite far behind in the engine bay with the mounting kit. And if he isnt tracking the car heavily anyway, I dont think it would make any significant difference to the handling for normal driving.
Here's a googled example:
The thing about those F and Lambo cars is the driveability. You dont have to rev it high or wait for the boost to kick in before going fast, or having that sudden surge of boost giving you worries about traction especially in corners.
Having that big revvy engine gives you a sense of limitless power across all rpm ranges, a feeling small cc turbo engines can never give you. The ability to pick up speed at almost any gear, and without the need to floor the throttle to gain speed is some magical feeling on the highways. (One reason why I hated my vtec for normal driving; you have to be flooring the damn thing all the time to be making any good speed). Putting in a Supra engine without an overly big turbine (400-500hp easily achievable) gives you a closer feeling to that.
Speaking from experience btw.