1964 c10 230 I6 Stumble

[Gofaster]

Hi,
I need the community's advice regarding the 230 I6 in my 1964 c10. It idles great and runs well with the choke out, but stumbles/bogs and sometimes dies under acceleration at low speeds with the choke in. The firing order, float level, air/fuel mixture, and fuel delivery are all good. Vacuum leaks are nonexistent. I've checked the timing as well, and all seems to well. I'm thinking it might be the jets? Sorry for the long post but I felt I should eliminate redundant replies by listing what I've already checked. What could be the cause of these problems?