I purchased the DP6019 recently and have a bad stumble off idle and I can’t figure it out. I’m using Hedman Hedders and the Holley 8007, stock distributor. There is plenty of rev up in the garage, but when I take it for a ride, it falls on it’s face just after idle. It picks up speed in about 5 seconds with a lot of oomph, so I know the potential is there. The engine is fine, and was running perfectly before I made the change. I have tried different vacuum ports, different accelerator nozzles, and even different springs in the distributor. I also replaced the vacuum advance to be sure that was working. What can you tell me to help me with this?