Hi BIGREDZ-----------Ron is correct. The ECU and AFM for '77 and '78 280's are the same. There were some changes in the '79 components, chief among these being the number of pins in the AFM and the size and shape of the AFM cover. To be completely sure of getting the right ECU, match the numbers on the sticker or plate on the unit. This works for the AFM as well.
Roadman