William,
The original filter was screwed into the carb. Your after market carb should have an inline filter somewhere between the pump and you carb. It could also be between the tank and the pump. If there is NO fuel filter you could have a lot of trash in your carb causing multiple issues.
If you end up replacing your fuel pump, beware of the Holley pump marketed under numerous names. NAPA carries a pump that is made by Carter which I am told was the OEM manufacturer.
Good luck.
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