depends, it will give you more amps at a lower rpm which would be good, just not sure about the overspinning part. Almost positive that it wont give you more peak output though, pretty sure that has to do with the internals
If you didnt ever run your car to the limiter then it most certainly would work just fine
but I would research your alt b/c I've seen some GM alts that do rated power at ~1500 rpm and not sure if thats what you have?