Well I give up! All of your suggestions of things to check to discover why my dual carbs run so rich have been tried and have not solved the problem. To re-cap, I have a rebuilt 218 with an Edgy head and cam, electronic ignition etc. etc. The fuel system has been cleaned so that the fuel to the carbs is spotless. To-day I checked to see how much pressure the new mechanical fuel pump was putting out, it was 3 p.s.i. Also did a compression test that showed 3 cylinders at 145 lbs. and 3 at 150 lbs. I run large air cleaners, my vaccuum guage shows no vaccuum leaks and the carbs have been checked and re-checked to make sure that they are OK. I have lowered the float level. So unless anyone has any bright ideas as to what's going on to-morrow I'm going back to 1 carb which is really going to screw up my great looking engine bay but at least I'll be able to drive the d--- thing.
Have a great weekend all,
Gary