1978 Mercury Monarch Ignition Boxes & Controllers
- Holley®EFI™ Crank Trigger KitMercury Monarch 5.0L 1978, EFI™ Crank Trigger Kit by Holley®. Holley Performance Products has been the undisputed leader in fuel systems for over 100 years. Holley's products include carburetors, fuel pumps, fuel injection, intake...Engineered to help enhance speed and fuel efficiencyDeveloped using innovative technology for outstanding performance$539.95