I know the PERFECT car for a 4 rotor engine... a replica of the Mercedes C-111 MKII (MKI was "only" a 3 rotor.) A 13B based 4 rotor would be a little small for it I think as it was a 4.8l 400HP NA 4 rotor- all in an beautiful looking exotic mid engine 2700lb car.
I have a 1971 buyers guide and it has 4 wankel engined cars by 4 different manufacturers! Citroen M-35 (don't know if it make it to production) w/ 500cc 55HP 1 rotor, Mazda R-100, NSU RO-80 and the Mercedes C-111 MKII (didn't make it to prod, but reviewers did test drive it!)
OK, now one of you guys make this thing-ha ha.

 

how about a gt40 kit car or a 65 mustang?

mike