Nacho,

That is what I am afraid of (that OEM rebuild parts won't work for the high-output alternator).

I just replaced some fuel fittings so I had to run the car for a while to check for leaks. Guess, what? Alternator is now charging. Cold the alternator was at 14.5V down to 13.8V when the car was good and hot. Under a big load (AC on, max blower speed), the alternator was holding at 13.1V at around 900 RPM (out of gear idle).

I guess I will just have to keep an eye on the ammeter for awhile. I do have a pretty good battery (big Interstate 110 minutes reserve) so hopefully if the alternator chokes, I can get it home before it dies.