Sorry, it is a 1971 Swinger with a 318, auto, A/C, PS, manual brakes (was 4 drum, now front disc/rear drum).

I was told to turn the key ON (engine OFF) and hold a screwdriver in front of the pulley and feel for a magnetic pull to the pulley. I tried with NO magnetic pull. I then started the engine (volt gauge ~10-11V) and tried the screwdriver magnetic pull test again. I felt NO magnetic pull (front or rear).

Looks like I need an alternator. I see there is a 65A or a 50A unit available for my car. I assume the 65A unit is what I need (because of the A/C)?