Problem solved. I did a few things so I can't be sure exactly what the problem was.
The short rubber fuel line between the filter and the pump looked pretty ratty so I replaced it with new line. It may have been cracked and admitting some air.
I pulled all the plugs. They looked pretty good. Minor discoloration and a tiny boot of soot/carbon. I cleaned them up and validated the gaps.
I went to pull the carb off to do a rebuild and notice that the nuts holding the carb on weren't tight. For whatever reason, there weren't any lock washers on the bolts. Could have been sucking all kinds of air in through there.
I got the carb on the bench and I'm pretty sure the accelorator pump was shot. When I pushed the plunger up and down with fuel in the bowl, nothing happened. I used the rebuild kit that I got from Napa and went through a rebuild.
I got the carb back on the truck and it started right up. After about 20 secondsI had fuel geysering out the top of the carb. Long story short, the float was sticking. The rebuild kit I got had a tiny little wire clip the attached to the top of the float valve and hooked over the end of the float lever. I guess it was supposed to insure that when the float fell it would pull the valve open. Having the clip on the end of the float was jamming the valve open. After three times mounting the carb only to have fuel spray everywhere, I just scrapped the clip.
Finally, the truck started right up and didn't gush any fuel. It purrs like a kitten. The driving is much better. It doesn't sputter under acceleration and seems to have a lot more giddy up. I took it for a nice long test drive without issue. Although it was very frustrating to have to mount the carb 4 times, it was exciting to be able to figure out and solve the problem.
Thanks everyone for all the suggestions and help.
