Is there an aftermarket ECM, i.e. Haltech, Elctromotive, Holley etc. that will pug into the stock harness connector?

thet woudl bethe easiest way to upgrade and tune, instead of using a "piggyback " or DYI PROMS.

thanks
Steve

A buddy of mine had to re-pin his connector, but it plugged into the holley commander 950 ecu without a problem once it was wired correctly. He's running it in an older model S-10

Teeleton