Hello. The carb in question has already been replaced, but if this is the result of something I did, I'd like to avoid it with my new carb.
The issue was fuel leaking out of the throttle shaft bore (mainly on the passenger side) and a noticeably loose fit of the throttle shaft in the bore itself (I could rattle it back and forth a hair). There was nothing putting and pressure on the throttle shaft and everything moved freely in the linkage. This carb had maybe 5000 miles on it tops, but it did spend a few months in storage off the car right before the problem began.