Stop in for a cup of coffee

redfastback said

Just an fyi,you can use the ported constant vacuum source on the carb for the vacuum advance if you want. It does not work as well on cars with power brakes, best on manual brake cars. During hard stops can kill the car . In fact late 50's to early 60's cars came like this from the factory

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No reason to set the initial timing and then plug in the vacuum and advance it to 25 ° or so at idle. Stomp on the gas and the vacuum signal goes away and the advance goes back to your initial setting plus what ever mechanical happens due to rpm. Ported vacuum is no vacuum at idle because the port is above the closed throttle plates.