pimping a century

I was just wondering if there is anyone who has pimped their Century. I would like to know what I could do to add more HP to my 1990 Century Custom with a 3.3L V6. I've heard that you can install the 3800 plenum and supercharger, injectors. Anything else? How would you go about doing it. Any ideas would be appreciated.

Alo how would you go about installing a 4-speed transmission?