Mopar Performance Multi-Port Fuel Injection Kit for (258) 4.2L 6 Cylinder Engines Jeep® 6 Cylinder Vibration Dampers for Multi-Port Injection System 4.2 to 4.0 engine wiring harness for 76-86 CJ Regular price: $550.00 Sale price: $510.00 If you have questions you can reach us toll free at 1-800-699-5337.