I had my Sprint carb rebuilt by Cliff Ruggles and it made a huge difference. I am not sure exactly what he did but it is almost night and day. I told him my car was staying stock and I wanted the best possible performance out of it. He is not cheap and has a very long backlog but I am very happy. However, I would bet the dollar difference is not all that great between his rebuild and a new Holley.

BTW whatever you do, do not throw away the stock linkage, it borders on being priceless in the Sprint market. Very, very, very tough to find replacements. Let me say it again, very hard to find replacements. Manifolds are a dime a dozen, linkage and air cleaners are the real money makers if you can find them.