Running rich....To big of a carb or?

With vacuum unhook and plugged, I advanced the distributor to the point that the starter labored almost like a dead battery. I fired it up and at about 800 rpm I was getting a reading of about 45* . I backed it down to 43* . Seemed to start ok and run ok. It may have been ruining a little leaner. But holy advance!. Lol.