vs daze
Have you put a vacume gauge on this carb and set your idle mixture screws ??? I'd go about 1/4 turn more open ( turned out ) than the highest vacume reading.
http://www.youtube.com/watch?v=RUrCP_KPLYY
Does this vehicle have power brakes ??
Descibe your timing settings and let us know what ur doing in that area.
Check the gap between the accelerator pump arm and the lever on the pump itself. Its where you see the spring with a nut with a bolt threaded through and the bottom of this bolt makes contact with the pump lever. Holley says something like .010 gap right there at idle. I like them with no clearance right there but make sure there is no pressure on the pump lever either at idle.
most 750 vs carbs i've messed with like the orange cam with the 31 squirters , but i'm sure each application is different
here is ya a video on that too
http://www.youtube.com/watch?v=eiRIfcrc2yA
I like to drill the throttle plates too ,, but it only works if you need it.
I've took the check ball out of a couple vs carbs vacume canister , one race and one street. The street car bogged on a hard pull , so we put it back in. I didn't get a chance to take a look at the secondarys to see if there was a problem ( this wasn't my car ) but we put the check ball back in and the stumble was gone. My race car , loved the check ball removed.
I'd get the spring kit for the vacume canister and a new diaphram to make sure it doesn't have any cracks or leaks.
Since you say you are experiencing a stumble off idle , I would look at the power valve too , if you have one rated too high , you'll have a hole in your fuel delivery waiting on the valve to open. You need a vacume gage here too.
http://www.youtube.com/watch?v=6vKlAnKdcB4
