The techinfo will answer most of you answers but if you have a 90 model it is still the plan 3800 Vin C not the series I or II. I don't think there is even a SC made for that engine, If it was possible.
Instead of supercharging your engine, why not just drop the 32V Northstar in there..
That would be fun i would think. If i had the money, time, and resources, i'd do it..
They produce 300hp stock, i wonder how high you could get one of those?