well i have had 13 mazda minitrucks, and i have a mazda rx7 with rotary that i just put a turbo on, that rotary is so small that if you can cut and weld that swap would be cake to you. but no its not a direct swap, im thinking bout doing on this new mazda im building so if i do here soon ill keep you posted on exactly how hard it really is, im trying to find a donor rx7, well i found one but im trying to barder with the guy to get rid of it cheap.