C1 Engine sputtering on sharp decline

Hi, guys. I have a 1960 Vette (not original parts, but all appropriate). Recently replaced the fuel pump and had the carburetors rebuilt.

But...on a steep decline, especially when braking, I really lose RPMs to the point of near-stalling or stalling. One intersection in particular, with a stop sign at the bottom of a steep decline, gets me almost every time.

Might that be the pick-up tube in the tank?

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C1 Engine sputtering on sharp decline