Hello all,
I recently swapped a 350 into the place of my worn out 305 TBI. All of the goodies from the 305 swapped right over. I got the new injectors, knock sensor, all that good stuff. I am having a hard time finding the correct ecm. I have read some were taking one out of a 1987 caprice ending in 8746 for the service number.
Where would I find this ecm? It seems to be the key to my success and turning out to be a brain buster!
Thanks you guys! 
I recently swapped a 350 into the place of my worn out 305 TBI. All of the goodies from the 305 swapped right over. I got the new injectors, knock sensor, all that good stuff. I am having a hard time finding the correct ecm. I have read some were taking one out of a 1987 caprice ending in 8746 for the service number.
Where would I find this ecm? It seems to be the key to my success and turning out to be a brain buster!
Thanks you guys! 
five7kid
Moderator
close
May 4, 2026
I don't know the answer to your question, but I'd suggest looking on the TBI forum. And, now you've got a bump in case someone here knows the answer.
Senior Member
If your still using the TBI injection, just swap the engine over and have a custom chip burned. No reason to need a different computer.
Junior Member
did you use the stock cam out of the 305 when you swaped it over or did you change it?