I have a Sniper on my '65 Coronet. It works just fine with the Hyperspark ignition setup. I've written a few magazine articles on the install as well as shot some short youtube videos. Proper wiring is critical. If you don't have a decent understanding of EFI wiring then you'll want to get some help with the install. The Holley instructions don't go into much depth and a lot of "old school" hot rodders don't understand how important wiring layout is for a microprocessor. If the wiring isn't correct the Sniper won't run.
https://www.motortrend.com/how-to/holley-hyperspark-install-tune/https://www.youtube.com/watch?v=64DrLMCLULA
