Holley HP EFI ECU and Harness Kits 550-606N performance-exhaust 4L V8 1964 - 1965

4L V8 1964 - 1965 Mercury Montclair 390/6

1966-1966 Chevrolet Chevelle 283 CID

Stainless - TIN0017SS

Stainless Steel Perforated Exhaust Core

Year Make Model Engine Fitment Notes 1973-1974 Buick Apollo 5

Holley HP EFI ECU and Harness Kits 550-606N performance-exhaust 4L V8 1964 - 1965HP ECU AND HARNESS, FORD MPFI, NTK Looking for a alternative for your stock or built late model factory FORD EFI engine? How about a replacement ECU for your older Holley C950? Holley has you covered. HP EFI ECU and harness kits are designed to be used with popular factory EFI engines as an alternative to the factory ECU and harness or as a replacement for your C950 ECU. The HP allows you to accurately control the fuel and ignition of your engine