Thanks for the great photos. I see that you are not using the wiper vacuum side of the booster. Assume you have gone to electric. My engine has a tee connection at the wiper motor and another hose which runs to a valve which I assume acts on the heater flow. Does your engine have this and are you suppling vacuum to this valve in some other way? My car has had an engine swap. There is a 1961 292 engine in it, therefore the vacuum system is different. My booster is connected to a tee with the PCV valve. I am removing the valve as I can’t get the engine to idle with it in place. The new
carb I installed was for the old 1957 style engine which did not have a PCv valve. Sorry for the long story.