Slant six Holley 2280 stalls when stopping

Does the 2280 use a dashpot?? Dieseling usually means bad timing in combination with too high of an idle setting. Also, I'd look hard for any possible air leak issues on the carb or manifold.
Yes I am believing it does have a dashpot and timing has been 5 btdc and the idle as you can see if set pretty high so Im trying to get that down below 1k and find why it will just die after idling for a short while when set below 1k.
thanks, Lefty. From a lefty also.