There is no uniform generic statement one can make about SR carbs that is 100 percent accurate (except one stating the obvious).
GENERALLY, the A/T carb will be used for service, but not always.
And the 7029273 was serviced by the 7029270.
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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