can you put a 20b rotary engine in a 1988 gtu? and if you can how much are they.

 

Moved to 20B forum.

 

It fits, but you need custom engine mounts, and there are fitting issues with the NA hood and sway bar. You would probably also need to swap in a stronger TII drivetrain. IMO you should start with a TII chassis instead of an NA FC. See the 3-Rotor Conversion Planning Websites in the 20B FAQ:
https://www.rx7club.com/20b-forum-95/20b-faq-links-370451/

A used 20B-REW engine is about $3,000 to 4,000. The whole conversion usually costs about $10,000 to $35,000, depending on the quality of the conversion.