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Cam isn't going to do much without giving the air more room to move in the intakes/heads. Do all at once and net yourself some real gains.
+1
Keep this in mind, the 3.8L does not respond nearly as well to mods as the 4.6L and 5.0 engines do. While cam(s) can add nice power on a V8 with little supporting mods, sixers need a little more secondary work.
But yea, if you can do everything yourself, then "cheap" power mod it is.