Electrical Help Please

More Confused Than Ever..............

I removed the battery and alternator today. I took them to Advance Auto Parts and Auto Zone both to see what they both had to say about them when they load tested them out of the car.

Advance Auto says battery is OK. They said the Alternator is bad after load testing both. Advance Auto could not get an alternator like I have. I'm not sure because I didn't buy it but it looks like the one on a 1972 D300 pickup. "Square back alternator" I think it's called. 60 amps. Nothing special. Since I couldn't buy it there I went across the street.

Auto Zone says battery is OK. I did see the battery was showing 58% after being load tested twice. Seemed kinda low to me for a good battery? I came home and put it back on the Battery Tender and it confirmed it was below 75% charge by the LED lights that were lit. However, the flashing green LED that came on 5 minutes later told me the battery was up to 80% charged again. Auto Zone said Alternator is OK. Advance said alternator was bad. Who do I believe?

Suggestions????