Slant six Holley 2280 stalls when stopping

Thanks for the replies. So timing is 5BTDC right now, I have tried it higher and lower. 12BTDC and TDC. No change.
I have tried using vacuum gauge to get highest value, ~17".
Engine still wants to take a dump if I go below 1k or so.
Wondering if I should get a replacement carb but I am not able to throw more money at it and as I have said, the arthritis in my back and hands are making it more difficult and less pleasurable to work on the old girl, consistently.
I would like to find someone in the area around Seattle that might have a carb I can at least swap to see if its all just in the carb. ;-)