No, it would likely be heavier. No argument there. However, if I was trying to lighten the Supra to offset that weight gain, the added torque is well worth it in my opinion. Of course, you'd have to do serious weight reduction, I'm not talking about swapping the battery, wheels and seats =)
The super GT Supra utilized the V8 in the later years of its racing career. The hybrid one currently does as well. It's all about blasting that torque coming out of corners
Anywhoo, just my two cents.