I have a 87 s10 blazer that was originally a 2.8 with the 1227429 ecm. I did a 4.3 conversion but did not change my factory wiring harness. I have been told I can just repin a few of the wires and I can run the 1228062 ecm but nobody can seem to tell me what wires to repin. I have an ecm out of a junkard truck that was a factory 4.3 but the service tag is gone. the prom is atba 7594 and the bar code inside the cover reads 078081117549219. Can someone please help me out. this is the last thing I need to do and this job is complete.