These will add some power to your car by freeing up the power that your cars accessories rob you of. [Note: If you have a big stereo, you should stay away from adding these pulleys as they will slow the alternator down too much.] Here's your choices for upgrading your stock pulleys.
ASPRacing.com is option 1. They offer a crank pulley. On their website they list applications for the 90-93 V6 3.1s and 2.3 berettas. Price is listed at about $120. Check out the site or e-mail them for more info.
Mantapart.com also carries these. They have pulleys for 2.8's, 3.1's, 3100's, and possibly the 2.3's, 2.0's and 2.2's as well. You can find pricing and more info on the website.
http://www.mantapart.com/engines.html - Start at this address and click on your engine for more info and other parts available.