Oh gee....... Where should I start. I am into extreme custom modification as much as the next person. However, the toyota motor in the mustang would be wrong in soooo many ways. I don't think I am going to get into that too deeply except to say, keep a ford powering your ford. Hell, pull the turbo's off the toyota and the 351 will destroy any potential the toyota motor has. If your dead set on using the Toyota motor, would it be different.....yes.......would it be unique....yes........would it be politically correct.......hhhmmmmm, I would think not. While you debate the engine issue, it may be a good time to put away that DVD of Tokyo Drift and concentrate a little harder in school. Knowledge is power, so give your brain a workout for a while , then sit and make an educated decision.
That's my $0.02......, or more like a nickel............$0.08