I wouldn't be so quick to judge guys. Those Supra motors make plenty of power. There's a guy here at the local track with one in a 240Z. He drives it to the track, bolts on the slicks, makes numerous 8 second passes then puts on the street tires and drives it home. Let's see any of you do that with your 340, 360, or 440.
They picked a cool car and a modern powerplant to make a unique vehicle and that is what hot rodding is all about.
Now if they had put a Chevy or Ford engine in it then I'd have to wonder why, but not the Supra, I know why.