Have a 496" BBC in my '55 Chevy Gasser. Orginally had a Holley 4 barrel and it ran fine. Bought a Hilborn electronic fuel injection and it wasn't cheap. Since I installed last Sep has never run quite right. Now it's gone to shit and is running way rich. Working with Hilborn tech for over a week and still ain't fixed. It uses a Holley ecu and harness. Anybody have any experience with a Hilborn system on your engine.