First welcome to the club!!
Glad to see another bolt in good hands. One thing that I see more times than not is a truck with an issue, many parts are thrown at it until the person working on it gives up and asks for help. Kudos to you for asking and you've come to the right place!!
Have you checked the timing, gap spark, and vacuum leaks? These are common culprits to your issue. First check the gap spark by removing the distributor cap and having a buddy crank the engine with the key on. As the rotor spins there should be a nice crisp blue spark at the points. If so, check timing and vacuum leaks.
As for the waterpump, if you remove the fan belt is should spin feely. If not, time for a new pump......
