[fastd]

To close this out:
I installed the 100 amp alternator and that seems to work. I get 14.0+ to the starter solenoid (so I assume pretty much the same to the battery).

I get 13.8-13.9 to the gauge in the cockpit. 13.7ish with the lights on and 13.5ish with the lights and the fan on.

I bought an amps mini clamp detector. I see about 16 amps drawn right after start up, about 26 with the lights on and around 46 with the lights and the fan on. The 61 amp alternator kind of keeps up at idle when the draw is 16 amps, but can't do it with any additional draw.

The old 61 amp alternator says it puts out 37 amps at 2000 rpm...it much only put out about 20ish at 800 rpm.

Thanks to everyone for their input.