Matt;
I've read in the past that the very best 4 bbl is the AVS style. This was on the 440 in the 70 Hurst cars.
Edlebrock is reissuing these and they are in the $400. range. Based on your engine and what cam and such, you select the cfm that you need, from 600 to too many.
I think in the long run you would be better off with a new carb, better suited to your needs. With what I've seen of the costs of rebuilding on old one, nicely done, costs are about the same.
Check it out and let me know your thoughts.
Ray