The "factory" aluminum SD tripower from about 1961 (memory can be hazy, and too lazy to look) had seven openings the same size as the opening for the snorkels. Somewhere around here, and don't ask where, I have a stencil with the correct spacing for the tripower version.
The tripower version is pretty scarce, I can only remember seeing one.
I know nothing about one punched for either a single quad or dual quad.
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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