I recently aquired a 72 c10 that I plan to restore over the next few years. I got it in Kansas and made the drive down to Texas (some 500miles). After about 200miles it died on me, we found out that the rubber O-ring inside the fuel cap was starting to rot into the fuel tank causing the fuel lines and filter to clog. After changing the filter it would run as long as I kept pumping the gas, so I drove the other 300 miles with a heavy-foot, made it home where the truck died in the drive-way. Now I cant get it to run?, I prime it and it starts right up, however, it dies in just a few seconds as the gas i poured into the carb runs out. It seems like although the filter is full of gas (and is not clogged) the gas does not seem to be reaching my carb. (A 3310, 750 CFM 4bbl Holley).
What are my next steps here?

Appreciate all inputs!