Not saying that the OP's and my combination are remotely comparable, but... if I "had" to buy a new carb today, it would most likely be one of the new aluminum Holley Ultra 850 HP (080804s).

The problem for me is I have a couple of carbs on hand now that haven't necessarily been flogged to their best tune / configuration. It's really hard to justify buying another one when there's other stuff waiting to try out already.