Man I was helping my nieghbor tune up his '74 Ford 4X4 today and man Fords suck. It's got a 390 in it with a little cam I think, headers & an Edelbrock carb. Are 390's just dogs or what?, cuz his won't rev for shit. We put new fuel pump,plugs,wires,cap,rotor,super coil,& advanced the timing a little and it still doesn't seem to rev out clean, it just seems flat & sluggish. Just thought you guys might know something about these engines.