91BLUES5

i just bought an 88 rx7 the kid i bought it from put a newer style 13b in the car but left the older computer and wiring harness in the car and the car will fire and some times run for a few seconds and the whole time it stinks like gas and seems like its flooded but i was wondering if anyone knows if those ecu's and wiring harnesses are compatable i have a newer wiring harness and computer on my 91 i just dont want to waist my time switching them if im not sure its gonna help