I put an LS1 engine in it from a C5 Corvette. I use to run TTS/ST2 with NASA, which only measures hp and weight, and got tired of getting killed by the Vettes with the same hp and 100+ ft-lbs more than me. Putting the LS1 in just means it's one less excuse I have
I still have a couple of rotary RX-7's though. Love the engine, but they can be finicky and really force you to stay left of the bang.