I wouldn't, fuck rotary engines, if you happen to blow the notorious apex seal, you might as well throw it out and yourself a new engine, Silvia's are quite fast, and a really nice, lightweight drift car.  Now if you're talking about throwing something like the 1JZ-GTE into the FD3S-RX7, then that would be a sick ride.  And yeah, that orange car, as far as I can tell is an NSX, definitely looks like a mid-engine setup, the hood isn't nearly proportionate to the RX7's curves.