Carb Help!!!

I didnt notice any excess fueld dripping into the carb and the big problem is I cant keep it running long enough to really tell whats going on. I'm running a stock fuel pump so hopefully i would be ok there. I took the 600 off the car and put the 800 back on and it fired right up and idled fine at 850 rpms. Def something going on in the 600 carb. Could it be the float adjustment???