Carb gurus needed inside

[encasedmetal]

hello, I have an 85' C10 SWB with a 305/SM465. In the mornings it takes 3 tries or so while pedaling to get the truck to crank, and then while driving to work it occasionally feels as if a strong wind just hit the front of the truck-similar to if I just lightly tapped the brakes for 2 sec or so. Any ideas on what this is or how I can get my truck to crank better? It has an electric choke and the choke light comes on when cranking but I don't know much about carbs so I'm asking advice from those who do. thanks in advance