Salaam ,
Then it is best advised that you stay away from Rotary engines and RX-8 , because there is no perfect engine in this world , and there is no other engine that can give you the same feel and performance like a rotary engine .
Dont get me wrong you can install other engines in RX-8, i have seen people butchering RX-7/RX-8 and dropping a 2jz/1jz in them , but that does not make that swap reliable , you will face new problems which will be dominated by handling of the car .
Again it is up to you , but i would certainly not recommend swapping a rotary engine .
Fahd.