I know the LS1 fits, and if I had an RX7 I'd go that route with a T56. Sorry but if your swapping motors with a different company (mazada to something else, why not use a Chevy V8?) Me personally, I dont think you get the respect from the Chevy guys, and the Rotary guys disrepect it too. Thats why I say stick with companies. Im putting a Toyota V8 into my Toyota Car, and I think that will make me more so liked by Toyota, rather than swapping in a cheaper costing less complicated Chevy V8. My 2cents
Jeff