None of them come with the exact supras engine, but a varient that makes it a straight and common swap for one (a lexus is just a toyota, there no such thing as lexus in japan, they just use the name here on the posher cars as people dont have high enough regard for toyota here).

That one has all the bits to make 800bhp with no bother, id have no reason to doubt it fron all thats written if correct.

Thats just auction pics so id be a bit worried how good the car really is, but with Motec etc they not been scrimping on bits