1986 305 vacuum advance question

Background: My 86 Pontiac has a 305 with a regular quadrajet that I replaced the stock varijet with. The heat riser valve set up is no longer
functioning, but the heated air intake (stovepipe) does work. In really cold weather, the car stumbles on acceleration for 4-5 min as the choke comes off. Setting the choke too rich causes flooding problems if the car is used for short trips and restarted often. I was wondering why the timing advance line has a temperature switch that only allows timing advance once the motor has warmed up, and if bypassing this would affect anything like allowing the engine to accelerate better even if it is not completley warmed up. And because I switched carbs,and may mixed things up, should the vacuum advance hose be connected to ported vacuum or manifold vacuum..
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