Carter Thermoquad 4bbl. carb for sale

4000 would only be the early cs or the 71 340's with angled idle screws, im looking for one of those. One in the pic is likely 72 & later 6000 series, like stroker said number is stamped on base. Pic shows a 4000 series note the angled idle screws and different front bowl vent, also choke linkage is off to the side on the front 4 carbs.