1983 silverado carb questoins

i bought a 83 silverado 3/4 ton pickup 4x4 today and the fuel/air mixture has too much gas. it has the stock 2 barrel, how do i get it running right? there are 2adjuster screws at the base of the carb in the front but i dont know how to adjust them. any help would be great, thanks

sorry, didnt read the mod post before posting