I have a 73 Mazda rx3 that has a seized 12a.the exterior and interior are beat to **** but we have that covered.i have a few questions that maybe you guys could answer. How hard would it be to swap the seized 12a out and put a 13b in.what parts would it need for the swap and if the swap would work would it fit with twin turbos.im new to rotary engines and I can’t find anything for the swap I’m looking for.let me know what I would and if you have any questions about the car I can answer them.thankyou so much