Another alternator upgrade thread

I know this has been beat to death , but I just can find the right answer.

I have a 71 duster with a square back alternator. I would like to upgrade it because I now have eletric fuel pump, 2 fans.....blah blah blah and the current amperage just ain't enough.

I wanna upgrade to around a 100amp , but what's the easiest way to do this? I already know I have to upgrade the wiring to batt. By bass amp meter. Ect.

What alternator do I purchase to replace this one.??....or is it easier to take my alternator to a shop and get it rebuilt (if that's even an option?) when I look online for alts. There just seems to be so many different options, so I wanna know what has work best for you guys with the least amount of headache.

Thanks