383 cam/ setup help

Ah, sorry I missed the ez FI Part. Carburetors are velocity-sensitive devices but cannot compensate for changes in density. Increased altitude reduces the amount of oxygen in the air, which is why carbureted cars tuned for sea level run rich when driving over the mountains at 6000 ft. when you are on vacation. Does the ez unit compensate for that? Your problem may just be a top heavy cam. MRL installs these systems, maybe he will chime in.