Holley Sniper EFI Self-Tuning Fuel Injection System Quadrajet Base # HO550-869Fuel Injection System, Holley Sniper EFI, Spread Bore Flange, Self Tuning, Tuning Kit, Gold Throttle Body, Kit Injection Style: Throttle body Fuel Injection System Type: Single 4 Barrel Throttle Body (Spread Bore Flange) Maximum Horsepower with Gas: 500 Timing Control Compatible: Yes Power Adder Compatible: No ECM Included: Yes Self Tuning: Yes User Tunable: Yes Fuel Pump Included: No EGR: No Transmission Controller Included: No Metering Style: Speed