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I don't think Holley's do have a means for a dash pot.
Currently I'm working on a set of annullar booster. My thoughts are a carb has two equally important jobs. Mixture ratio and Fuel droplet size.
The annular booster I've used in racing showed a huge " set of the pants" improvement as long as the timing is set accordingly.
Smaller fuel droplets have a faster burn rate and seem to need less advance. I was running 34 degrees and went to 28-30 degrees with an annular booster and it brought the motor alive coming off the corner. They thought I was running a 383 in stead of a 355.
I have found in high vacuum situation on carbs, that the accelerate pump discharge nozzle screw needs to be modified to accept a small spring to keep the tapered needle seated. At constant throttle, high rpm the airflow will siphon fuel from the pump nozzles.
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