1975 d200 carburetor replacement

I'm new to this forum and have a question in regards to changing a carb for my 75 d200 truck.It has a 318 with a 2 barrel carb.
The carb never has worked right,even after I rebuilt it.Someone told me the stock carbs have troubles on steep hills,(my driveway).
Should I get an aftermarket carb,if so which one?Is there an adapter plate which would allow me to get a different carb while using the stock manifold?
Any help would be appreciated.Thank You
Author: slacker200