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Originally Posted by Grandma’s 68
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NAPA is they actually have values for pressure and flowrate. Seems like Autozone and oreillys don’t think that’s important.
I don’t want to replace the pump with another one that may have still have excess pressure and get no further forward.
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I think it's likely if you get a stock type fuel pump from a store other than NAPA for a 1970 or earlier Chevy with a 4BBL 350 engine, it will have the right pressure to work with a Quadrajet. Here's one a Jegs that says it is 5 PSI. The part number is 117-MF0001. I imagine (but admit I don't know) it is the same part Autozone lists as AMF0001.
https://www.jegs.com/i/Delphi/117/MF0001/10002/-1
I don't know what to think of NAPA. When I go to the 2 links you provided and click the link to check vehicle fitment, for both the 5.5 PSI and the 9 PSI fuel pump say it does not work on a 1970 Chevy C10 pickup.
Edit: It could be a 5 PSI fuel pump would still give you problems that appear to be pressure related if your carburetor is having a problem with the needle and seat and float.