Welcome!
I had a 3100 in my old car, 1995 GP SE. It was the first (160hp) version. Just make sure you keep an eye on the oil and coolant, those damn intake gaskets are a bitch!
As for information, check out
http://www.60degreev6.com it's the most comprehensive site on the 2.8/3.1/3100/3400 and other GM V6 engines.
If you really want performance, you are probably best to do an engine swap of some sort- my dream would be the 3.6DOHC! Other than that I would just do the rims and tint and enjoy the ride.
Welcome!