If it ran for a while and then stopped it sounds to me like it would be a fuel problem too. There are many things you can do to check out what is going on without a lot of test equipment but they could be hazardous if you don't do them correctly. and sometimes hazardous even if you are careful.
what happened when you used starting fluid? Gas will go bad it it sits around for long periods of time. Even if you put new gas you still have old gas in the tank, lines and carb. without trying to start the engine open the choke and look down the carburetor. With you hand pump the throttle all the way a couple of times. Did you see a stream of gas spray down the barrels of the carb? That would be from the accelerator pump. they prime the system before you start up or pump extra fuel when you accelerate. If you didn't see streams of fuel your carb may not have any gas in it. (Or the accelerator may be bad) If you did see gas then go inside the truck and try to start it up. If it cranks over but doesn't start try holding the gas pedal to the floor and crank the engine over for a while. It may be flooded. after cranking the engine over for a while do you smell gas out of the tailpipe? (a sign that it may be flooded)
On the work that you have done, why did you do the distributor? if the truck was running before it was parked you should only do things that relate to a hard start. Changing the distributor and wires may have made your job harder to diagnose now. How did you set your timing without starting the truck and using a timing light? you're going to have to make sure the distributor timing is correct and that you firing order is correct before you can do anything else.
You say you did the manifold gaskets... for the exhaust manifold or the intake manifold? Why did you do them? is there another name for your starter fluid pump? Took the vacuum lines off so your vehicle doesn't use vacuum for the heater mode and doors? Does the distributor have vacuum advance? if it does is the vacuum for that still on? No EGR on your truck? If your truck came with an egr valve
it will actually run better if it is hooked up. (will get less engine ping when it gets hot or on acceleration)
so first thing make sure you're getting spark at the right time.
make sure you are getting fuel from your carb. accelerator pump and idle ports. make sure it is not flooded.
and see what happens