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Apparently you can make quite a lot of power out of those 3.8 engines with a procharger. Quick search had about 290 at the wheels on a fairly stock setup. Get some mac long tubes and convert to duals (should be able to find some gt takeoffs for the exhaust and valence), find a gt 8.8 with tloc and hopefully some better gears for pretty cheap too.
I might look into a procharger but they ain't cheap. The headers and exhaust with a cai and tune will help. Hard to believe that a V can make as much hp that the old V8 cars in the 60's and early 70's.