Is there a difference between a ecm from a 4.3 v6 and one from a 350 v8?Some pins are broken in the one I have where the wire connects,so i need to go to the jy and get another.This is going on a 258.I have searched,but did not find an exact answer.
On your 258, the ECM has gone into limp home mode and is no longer functioning because you do not have a feedback carburetor on there. It can be bypassed easily and even be tossed in the trash to make the timing work properly.
The 258 is a straight six 4.2L engine that does not share much with a 4.3 V6 or a 350 other than the name 'engine' so I really don't understand the cross reference question.
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gmakra is correct, the 1227747 ECM's are all the same, just the images on the prom are different for the different programming required for different engines.. You can read the broadcast code label on top of the prom, here are just some examples, this is usually on the outside of the ECM case as well: