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Re: 3.8 V6's
You need to settle on a supercharger, and either pump or race gas, and how much power your looking for. Then do the heads and then pick the cam.
If it were a pump gas engine, I would keep compression around 8.5:1 and run no more than 7 psi unless you either mix race/pump gas or drive above 3500ft elevation.
Cam info would be something like 220's @ .050 with around 540-560 lift on a 112 lobe center.
Hope that helps...
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