prolly too late to answer your question since it was posted 2yrs ago but... ive looked everywhere for a alt thats more amps then 80 but no one makes them. since im a carstereo addict i needed a new alt for my 2002 zr2 cause 80 amps does not cut it and voltage can drop easily from 14.5v to 10.5v lol... anyhow i ended up having a H/O(high output) alt builder make me a 180amp alt but it costed me $380 bucks. anyhow if you still need one send him an e-mail. this is his website
http://www.excessiveamperage.com/