Harb/RK no EGR. It is a regular Eldlebrock int/carb w/ elect choke. Checked vacuum line & advance... seems to operate good. I don't mind trying both ideas for carbon. It can be shifted at 1500-2K no problem & lugs like a pig... probably did not get wound out much in its life. Even w/ bigger cam, power curve is low/mid. I bet there is carbon build up... good idea.