I've been read all I could find, and there are a lot of varying opinions on replacing/upgrading alternators on our old mopars. So much so, almost feel more lost than when I started.

What are the stock (amp) specs for a 70 alternator?

Would swapping out my anemic alternator with this one be worth it? All I want to do is prevent dimming lights and keep my radio powered at idle while stopped in Drive. BTW, aside from an aftermarket CD-Radio, I am not running any other non-stock electrical items (no electric fuel pump, no electrical fans, no amps, etc...)
If I did swap out with the 50amp linked above, would I need to do any rewiring as recommended with other high-amp upgrades?

Thanks