I would suggest reading the "Can I supercharge my SE or SSE?" article in the Techinfo, Specifications page. It answers alot of questions on this matter.
In Short to do this you will need at least the following items:
The L67 engine and drive train
The L67 computer and wiring harness
A new exhaust would be good
A new instrument cluster (or at least a SC boost gauge)
I would say you would almost need traction control if you don't have it. (because of the extra power) I might be wrong on this though. You might not need it but it would sure help.
Here is a link to the article I am talking about. If it was me I would do as it suggests and just see the 97' and buy a SSEi. Unless you have a L67 engine and drive train sitting around, It will probably about the same $ in the long run and you will have all the SSEi features like Traction Control, Digital Climate Control, HUD, etc.