Need Opinions on Alternator

Okay, so I'm in need of a new alternator and I ordered this Powermaster unit for my 74 Duster w/360 the other night...

http://www.jegs.com/i/Powermaster/713/17519/10002/-1

I have some questions after doing some reading about the Chrysler electrical systems. It seems as if they aren't very robust and a higher amperage unit can cause issues. This Powermaster unit is a 90 amp. I'm not sure what the alternator that I took off is because the part # sticker is half faded, so I can't look it up. Is the likely hood high that the 90 amp unit is going to cause electrical issues?

Along the same lines, I don't plan to run a ton of electrical accessories. No radio, no A/C, no electric fuel pump. I do how ever plan to upgrade the headlights, the fuel cell I'll be installing has a GM sending unit(0-90 ohms), and I plan to sooner than later go with a classic dash instrument panel and gauges kit. Is the 90 amp unit enough or maybe too much? Any help or info is appreciated.