Got it. If it’s pump gas there are other things you can do to stop run on.
If your CR is between 10-11:1 you can use a 180 thermostat. Sometimes just a 10 degree or so temperature drop can eliminate or at least reduce it some so other measures can get rid of it.
I’ve also used a standard reach plug before to get the tip of the plug closer to the cooler chamber wall. You might need 1-2 degrees more timing.
One range colder plug can help. That’s only if the plug you have is on the warm side.
Edit: you have a 200 rpm drop going into gear which is real nice. What is your idle rpm? Sometimes a 75-100 rpm reduction at idle can help that too.
You might need to use a combination of those things to clean that up.