81 rx7 13b twin turbo swap
 

just recently bought a twin turbo 13b thinking about putting it inside my fb i also purchased the front subframe from the fd anyone have anyclue if this will work or not

Anything will work if you have enough money and determination. That said for the amount of money you would probably have to spend on this you could buy an FD shell and have a more modern, better looking, and better handling car.