adjust carb before timing???

[thundercat 9]

Hey guys,

I checked my advance with a timing gun, it does advance when I rev the motor. My next question is should I adjust my carburator idle speed first and if so, what is the procedure? It is a rochester "quadrobog" 4 barrel. I think my idle could be off to begin with which I think would mean that when I set it at 8deg BTDC, it really isn't. I think??????

Thanks
jeff