Roundback vs. Squareback alternators?

RustyRatRod said

What most guys fixin these old cars up really don't realize is, for the most part, unless you're puttin in large by huge electrical accessories like big stereos, power windows, seats, big fans, ignitions you can weld with and such......you will never need even a 60A alternator.

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Yup.
Here's what I've measured on my '85 Grand? Wagoneer.
The Wagoneer similar electrical loads as a 70s A-body.
Ignition and field: 4 amps
Wiper, slow: 3 amps
Heater fan, Low: 4 amps, Med 5.5 amps, High 9.5 amps
Parking & instrument lights: 5.5 amps
Hazard lamps: 4 to 12 amps
Headlights, H4 /HB2 low beam (60 W): 9.2 amps

Power was supplied at 14.8 - 15 Volts