72 Dodge Dart Swinger

If it isn't pinging, try a few degrees more of ignition timing advance. Sounds like a timing issue.
Definitely on my list of to dos without a question. Adding the pertronix system I know timing needs adjusted.

Reading so many posts on FABO last night I’m leaning another direction. Because if the dead peddle at a certain rpm/speed, and learning my carb was molested at some point, I’m prioritizing throttle and kick down linkage.