I bought an 84 Bronco 60k original miles, 351w, c6, about a week ago I installed an Edelbrock cam & lifters, from idle - 5500 rpm, Edelbrock intake, Holley Truck Avenger 670 cfm carb, double roller timing chain, plugged off all the smog stuff, no vacum leaks, drove it for a few days, changed out...