Is my 340 Overcarbed? Avg 5-6 MPG

Sorry for the long delay on the progress. Momma has been out of town so I have been busy with the kiddos. Today I pulled the primary bowl and took out the 73 and went down to a 72 jet. I did not mess with the secondary side yet since WOT seems to be good. I also pulled the spark plug from the #1 cylinder and it looks VERY rich! I did not have time to tune or drive it yet tonight so I will work on that more this week and update you all from there. What do you think?