I had a 1963 with the SD 4-barrel, which was entirely TOO LARGE for the street. Removed the SD 4-barrel and replaced it with a Carter AFB part number 9400s (400 CFM). The before and after were like driving two entirely different cars.
As far as reliability is concerned, while I feel the Rochester 2 barrel and 4 barrel carbs of this period are among the most reliable carbs ever built, sadly, cannot say the same for the 1 barrel (type B or BC). MAJOR design flaw that requires work every few years. The Chevrolet guys toss the Rochesters in favor of the Carter 1 barrel type YF.
Jon.
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"Good carburetion is fuelish hot air". 
"The most expensive carburetor is the wrong one given to you by your neighbor".
If you truly believe that "one size fits all" try walking a mile in your spouse's shoes!
Owner of The Carburetor Shop, LLC (of Missouri).
Current caretaker of the remains of Stromberg Caburetor, and custodian of the existing Carter and Kingston carburetor drawings.
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