Only Chrysler alternator performance curve I've seen is the one Nacho got in a box with a revised squareback ( IIRC).

https://board.moparts.org/ubbthread...stem-upgrades-73-e-body.html#Post2609330

Notice the test voltage was 13.2 V
So can't compare directly to test in the shop manual.
Assuming magnetic field is a strong as it can get, the we could calculate the power at 1250 engine rpm if we know the pulley ratio.
P = I x V
Then divide by 15 voltage to ge the current it probably would produce at the higher voltage.

I can tell you this about this one wire Power Master Mopar alt I am using on my 63. Its an internal reg of course since its one wire. The paper said it puts out 95 to 100 max and will put out 65 amps at idle. I had a stock 35 to 40 amp alt on my 63 and I added a single electric pusher fan in front of my rad I can turn on if stuck in traffic on hot days for a good bit. When I turn the fan on at night with the headlites on the volts drop from 14 to about 12.5 at idle. They go back to 14 at about 1500 to 1800 rpm when stepping on the gas. With the Power Master 95-100 amp one wire when I turn the fan on with the headlites on at idle the volts drops about a second to about 13 and then goes right back to 14 to 14.5 even at idle. But I don't run dual fans but I like that it keeps charging better at idle then the stock alt did. I never had any dead battery problems with the old setup but I like that this alt keeps the volts at 14 even at idle with everything on. For my setup and my sons with the Sniper EFI its worked great so far. Ron

My current alternator FYI


https://www.summitracing.com/parts/pwm-8172