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The 82 alternator is probably 55A compared to the 80A in your car.
A big stereo shouldn't kill an alternator - maybe draw the battery down, but that's all. "1000 Watt" amplifiers typically mean they can put that out in brief peaks, not continuously. Shouldn't be a problem to either battery or alternator, come to think of it.
Try to replace your alternator with the proper Bosch unit, or source a later 740/940 (100A) Bosch in the junkyard and adapt it fairly easily. I've pulled fresh-looking ones with an un-faded tag saying "Reman.. by Bosch" and paid $15.
The AC Delco SI-series unit mentioned in the link in Geomar's post is kinda primitive. They have a reputation for being noisy electrically which is a real pain in a good stereo system. They were used in the 1970's and maybe early 80's. They are out there in the junkyards by the millions. Literally. The 10SI has a typical output of 60A and the 12SI (find it in Olds, Cad's) from 70-90A. They are large and heavy. I adapted a freshly rebuilt one into an old MGB I had - lots of amps compared to the little Lucas, but sure made the radio buzz. OTOH, the latest Delco CS-series are slick, small, and up to 140A...but electrically difficult to adapt into a car not designed for them.
Make sure you have adequate wire gauge from battery to amplifier(s) and, yes, use a 1-farad strike capacitor across the amp's power/ground terminals to keep spikes out of the car's system.
And turn it down when you are in my neighborhood!
--
Bob (son's 81-244GL B21F, dtr's 83-244DL B23F, 'my' 94-944 B230FD; plus grocery-getter Dodge minivan, hobbycar 77 MGB, and numerous old motorcycles)
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