Engine Mgmt., Fuel, Spark, EGTs, & Air/Fuel Ratios
'84 was its own year. The power and logic modules are unique. 85-87 are interchangeable. There were really only four part numbers. '84 TBI, '84 TBO, '85-87 TBI and '85-'87 TBO. I used to work as an engineer in the plant that made these units. I was the Manager of the Mopar Tech Hotline.