This is not a problem due to the Tripower setup. You're obviously running the carbs out of gas, hence the backfire and problem going up hills. It could be the fuel pump, but it sounds like a fuel tank pickup tube location issue (the tube with the sock on it).
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BONESTOCK GOATS
'64 GTO Tripower Hardtop (Wife's Car)
'64 GTO Tripower Post Coupe (My Car)
'99 Bonneville SE Sedan
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