Having done the 350, I can agree (from experience) with those stating the 455 is cheaper.
However, I had a reason for doing the 350, and would do the same again for my reason.
If I could subtract about 20 years, there is still about 200 pounds of excess weight on the car; but it is scary fast now, another 200 pounds less and it would be more of a hand-full. First gear is virtually useless now for driving in anger, and I refuse to tub the rear fenders.
Jon
__________________
"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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