Andy, the 1958 only Chevrolet 348 end carbs can be recalibrated to work on 1958 only Pontiac tripower. The 1957 Pontiac use different style linkage (unless you are using aftermarket linkage). The 1959-61 Chevrolet 348 end carbs have the fuel inlet in the wrong place to work with original Pontiac fuel lines (unless you custom bend a set of lines). 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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