The LS1 style 2-80 pin connector PCM can and does work in the 96-2000 Distributored Vortec trucks. The MOST popular PCM to use is the 12200411 service number PCM. There are 3 different wiring files depending on your year truck. 96,97,98-2000. You can also run CNP ignition on these older style SmallBlocks, using this PCM and a custom 24x reluctor wheel by EFIConnection.com. I also have the wiring files to convert the 96-2000 OBS SBC trucks to CNP. PM me your E-mail address and what year your truck is and I will send you the proper wiring file--If your interested.
Jeff