Junkyard FI Intake manis, fuel rails, throttle bodies for 440 Mopar

Kind of the same deal. I had a MAC Tool truck with a aftermarket Holley fuel injection in it. It was a 454 Chevy but still the same type chassis. I had constant issues with the injection so I took it off and went back to a carburetor. I didn't notice any increase in mileage, power, or drivability. It's up to you but a lot of work to inject a 440 with not much pay off. A vehicle like that only get's 5-6 mpg regardless of whether it has a carb or injection. My diesel truck got 10 mpg but the fuel was higher price. Not double in price so there was a savings there.