First thing to do is check the choke and make sure it works. When the engine is cold enough to need starting fluid, remove the air breather completely from the carb. get yourself positioned so you can see directly into the carb and open the throttle linkage all the way. You should see 2 things happen. One, the choke plate should close at least part way and 2, you should see a shot of gas going into the barrels. If you're not sure about the gas, hold the choke plate open and giver the linkage another shot.
If the choke plate didn't close, hold it closed with your fingers and try to start the truck. It should start, back off the choke plate a little and after a couple minutes it should be good to go.
If there was no gas, either it drains off or the fuel pump is getting weak. If the truck doesn't give you any trouble under moderate to hard acceleration, it's not likely the fuel pump. Trouble such as coughing or sputtering. These go away when you ease up on the throttle.
If it's the carb draining off then it is time for a rebuild. But, check around before you send it out. Call around and get a price for a total rebuild and then check online. It may be just as cheap or cheaper to buy new from someone like Summit Racing.