[Scutty]

After a recent rebuild, I have my 68, big bored, solex carbed, 050 distributed car running but cannot get it to idle below 2000 rpm. It pops (backfires) through the #2 and #4 throats every second or so. I have checked and rechecked the points and timing (4deg static advance). The carbs are rebuilt and recently rebushed. I cannot sync them as the rpm won't drop below 2000.
I suspected a float depth problem so I removed the sight plugs and adjusted the screw on the outside of the carb while it's running and backfiring. I could not get fuel to seep from the sight hole. Should I screw it out to deepen the bowl level until fuel drips out, or is that to far? Can't I take the carb off and set the float level on a bench? It would be a much easier adjustment if I could see in the hole and not have the thing backfiring in my face. Any good ideas or similar experiences?