i was trying to figure oyt what year car this ecu i have would fit is there are reference. the numbers are ajz service number on the ecu is 1226025 can anyone help me

From Snap On's Prom reference and TSB manual

If that is a correct GM number

1983 5.0L VIN H
1983 5.7L VIN 6

All 2.8L for 1983, all VIN's

Hope this helps