Offenhauser 2@ !bbl Holley swap info

Let me say first I'm an amateur at all this , I am looking for some advise about the offenhauser 2@ 1bbl Holley 1920 set up also. my 65 valiant 225/ was bored .40 over with a mild cam , has the offy , 2 holly 1920's , and headers. this is what I have receipts for from 1 of the previous owners. They took off the factory fuel pump and added this electric one on top shock mount. Soooo I'm having issues with the pump quitting after 10 minutes of running , and then It will work again after a 5 min. sit.

Should I go back to the factor pump ? Will one still work off the cam that was changed out ( don't know any specs on it ) And if so will the manual pump satisfy the 2 holly's? Not looking to race , just like the look under the hood of the 2 carbs , plan on cruise nights driving only.