Holleys instructions are really weak they are kind of a fly by the seat of your pants style. At first they said they MSD locked out would work with the sniper system. Then when you call Tech Because you can’t get it running. They say oh yeah that MSD won’t work very well you need to get another distributor like the $500 Dual Sync . As per your example on page 38 it shows options to pick but doesn’t tell you which one to use so you have a CD box and an MSD distributor which one do you pick it doesn’t say there and it doesn’t show on page 20 where they show you kind of how to wire it up they don’t even show the distributor and they still don’t tell you what to pick for your system I had to call the tech line to find that out. Now I see they have added a video on YouTube that finally tells you what to pick. I struggled with this system for two years putting in a dual sync made a world of difference and after moving wires all over my engine bay for two years I finally thought I had it good enough to go on a trip the power tour. But this breakdown was not because of the so sniper system. The distributor cap came loose I was trying to work on it on the side of the road and dropped a spacer out of the cap into the distributor and locked up the distributor so not really the fault of the distributor or the Sniper system