To get started in reprogramming GM eeproms, you need the software the programmer and a UV eraser. Several GM ECM's with additional features can be used on the 2.8/3.1/3.4L . When I was swapping those engines, I recall one P/N that on;y required 4 or 5 wires to be re-pinned on the ECM connector. Dont recall which on it was but it may have been the 730. The popular 2732 memory chip was discontinued years ago but new parts can still be found. If you are looking for the plastic plug in carrier; those are next to impossible to find.
------------------ " THE BLACK PARALYZER"
-87GT 3800SC Series III engine, custom ZZP /Frozen Boost Intercooler setup, 3.4" Pulley, Northstar TB, LS1 MAF, 3" Spintech/Hedman Exhaust, Autolite 104's, MSD wires, Custom CAI, 4T65eHD w. custom axles, HP Tuners VCM Suite. "THE COLUSSUS"
87GT - ALL OUT 3.4L Turbocharged engine, Garrett Hybrid Turbo, MSD ign., modified TH125H " ON THE LOOSE WITHOUT THE JUICE "
[This message has been edited by Dennis LaGrua (edited 07-01-2018).]