quick alternator question..

i have a nice soundsystem and want to upgrade alternator when i get 2nd amp..if need be..what is the amp rating on the stock alternator..97 chevy blazer, 4 door, 4.3 liter v6 lt version

by the way here is truck

http://www.sounddomain.com/id/chvyblazin97

stock alternator should be 100 amp. my 95 S-10 and my 2000 Blazer are both 100 amp.