I'm thinking you need to supply more information. Why a Holley carburetor? I'm guessing your car does need the dashpot to prevent the need to "two foot". The parking brake release vacuum motor is located on the parking brake assembly above the LH kick panel.
"cut, dangling line"? Would that be a vacuum hose? If so, what size? Two hoses come through the firewall in the area you refer to: vacuum for AC & vacuum for power door locks. Do you have either or both?
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