Now what?!!!

[lowesguy]

So my old 78 truck started really weird yesterday at work,like running on 7 cylinders? took back roads home just in case it stalled out,restarted today runs fine,lifted the air cleaner and inspected the carb,noticed fuel pooling on top of the accelerator pump location,manually flicked the throttle with engine off,accelerator pump sounds crunchy? think thats the problem with strange running condition yesterday? whats your thoughts on this problem,I was thinking carb rebuild kit,truck is stock and has run great for 20 years!