Brad,

I bought the first one in 2003 and the components are the original style Holley. Both old and new carbs have the 4500 metering blocks and screw in bleeds. This new one has the modern zinc finish and the updated float bowls with the larger (snap ring retained) sight glass and a (Red) billet Base plate. The only thing I don't care for with the new vs old is the plastic Acc pump lever arms.

I wouldn't sell my original one for $200 more than I paid back in 2003, by far the best and most responsive carb I've ever had (and that includes, Webers, Predators and lots of Dommy's)