Rotaries are not famous for tq... But they can scream high enough you have the real need for massive tq numbers... As for a rotary in a 924, I would use either the 928(sad eyes) or the 944 chassis as they look a shit ton better. If your going to really do this swap, just grab a 13b, port the shit out of it(bridge/race) then slap a carb set up on it and go. Basically all you would need to do is wire an ignition motor/trans mounts. If your looking for a rotary, I have a running bridge ported block that will come with a header and F.I if you want it, but if your gonna go carb, because it would be easier I would knock a little of the price off. Give me a PM if interested...

-Mike