The 1956 did come with Rochesters, however Carter built 6 sets (3 sets M/T, 3 sets A/T) of prototype dual quad WCFB's for Pontiac for 1957. Unfortunately (opinion), Pontiac opted for the 3 Rochester two-barrels. The dual WCFB's would have been just awesome; and later dual AFB's would have been even more-so. But then they called those Super Duty. 
Here is a link to a picture of the 1956 with Rochesters: http://www.thecarburetorshop.com/195...gerside2x4.jpg
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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