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Possible Idle hesitation.

Need to get a vaccum gauge on it. I like to go for highest vacuum and then richen it up about 1/4-1/8th turn. Keeps it passing emissions and smooths it out a hair. Also need to check the timing - if it's off you may be compensating for low timing w/ throttle plates opening a hair far and hitting the primary circuit.
 
I got the vacuum gauge yesterday and I have been watching on repeat uncle tony garage video on setting it up.

I’m sure it’s probably easy for others but I’m a bit confused “set to highest vacuum” etc even means. My edelbrock carb is at 2 turns open from being bottomed out.
Idle is at 750ish, and the issue in questions doesn’t happen every time. I have added 5 gallons of fresh gas as well in case the oldish gas was causing an issue.

I will hook up the vacuum gauge and take a video and go from there. Honestly, I wish I could just have a person here walk me through it in real time. I have a timing light but have never used one or even know what to look for.
 
You want to warm it up good,and watch the gauge as you turn the idle mixture screws..have the idle speed low,like 600 rpm or so,anything higher will give an inaccurate reading because the throttle plates will be open more..
You want to get the highest reading on the gauge,AND the steadiest--if the needle "vibrates" or wiggles,or floats up & down at the highest reading,open the mixture screws a little at a time ,and if it drops an inch or two,but stays steadier,that is where it'll run best...
Then you open the mixture screws just a tad more,so it wont be too lean when the engine is cold..

Unless you have a hotter camshaft than stock,you should get at least 16 to 22 inches of vacuum ,and you can squirt carb cleaner around any suspect areas that may be letting air sneak by like the throttle shaft bushings and base gaskets,and watch for any change in the gauge reading that will pinpoint any vacuum leaks..
 
As to the timing light, you look for the bright flashes..........

Sorry, I had to.
 
Ok...we’re good. Thanks @Bent77 and everyone else, including the old man for explaining it all.
It’s too about 18-19 on the vacuum gauge.
 
Not sure where exactly you're at but I'm in Glendale by the Cardinals stadium. Be willing to look it over if you're in the neighborhood.
 
30 something miles? That's my 1 way commute everyday. 1 megalopolis suburb to another is Evey day thing.
 
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