Here's something to shoot for:
Nobody makes a wiper cowl for the Monte Carlo, but if you compare the curve and length of the trailing edge of your hood to various trucks/SUVs Lund makes wiper cowls that might only need minor modifications to fit. Aftermarket cowl induction hoods raise the back end of the hood and do most of the job of covering the wipers.
Your generation of the Monte is the most aerodynamic to date. How about a pic? Stay away from big spoilers on the trunk that do nothing. Have you thought about lowering it?