You could replace your externally regulated alternator with a 10SI or12SI [Systems Integrated] internally regulated alternator. The 10si build by Delco only went to 63 amps but I think aftermarket companies such as powermaster wired then to put out 100 amps. They sell a lot of polished shiny ones but you can get natural for a more original look. The 12si were up to 94 amps but I have one wound to put out 140, not that i'll ever need anywhere near that, I don't even have a AM radio.
The 10si alternator is easy to install in your car and looks close to the 10DN externally regulated alternator.
One just wires it with the existing wires in your harness and the external regulator can be left in place to make the car look original if that is important, although with electric fans and radio amps ???
If you are running a large amp alternator you will want to upgrade the size of the wires you are using in your harness.

There may be a company out there that rewinds the original alternators for a higher output, don't know.