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Holley HP EFI
HP EFI seems to be the more basic version of Holley's Dominator ECU. It shares similar harness connectors and has similar functions, but is more limited in terms of inputs and outputs.
This forum thread contains a lot of pretty good information about how to make the Holley HP EFI and Dominator run on a 3800:
https://forums.holley.com/showthread.php?16249-HP-EFI-On-3800-V6-Engine/page4