My IROC was a 305 and along the lines it got changed to the 350, I do not know who did the change or when or what was done. I do know for sure(at least 99.5% sure) that it is a 350 because the guy I bought it off had it rebuilt and he thought it was a 305 but once it was taken apart the builder found it was a 350. So now to my question, is there a need to change the prom from the 305 to the 350? And is there a way I can tell if this has been done?? thanks.

 

read the numbers off the top of chip. if present. post them. or any other pertainent info on top of chip (aka aftermarket).

 

Ok now I got s dumb question where is the ecm??

 

Mine is below passanger dash. A cover needs to be removed to access ECU.