I got a few of those on a car once, one of the worst ideas I've ever seen put into production, next to Scotch Locks, which ARE, without question, the WORST idea for electrical to EVER be produced. I can't count the number of vehicle and component problems I've fixed because somebody used a Scotch lock.
The posi-locks would be good for a temporary repair to get you back home, but that's it.
I was going to suggest the '7730/SD swap as well, and an intake swap, seems most 383s fall on their face pretty early on in the power band when using a TPI style intake. To me they put the TPI on the wrong vehicles, they should have been used on the trucks due to their low end torque production, and limited power band.
Using the '165 ECM though, I would look at $6E code mask, it was the last and AFAIK most advanced code used in the '165, which many $32 and $32B users seem to swap to in the end. It was used in 1989 in the '165 ECM. This also eliminates the need for the cold start injector.
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