For the ECMs check the "Service No." on the paper label. A 1227148 is for the '86 & '87 cars. Not sure what the number is for the earlier ones.
As for the chips, remove the small cover (two screws) and look at the chip in the holder. If it has a small silver label with a 4-letter code then it is most likely stock (ACXA or BBKJ for example). The aftermarket chips have a different type of label that is sometimes hand written.
RemoveBeforeFlight