well your fucked, the 3800 isnt a HP motor....its geometry isnt for that, its optimized for a flat low/midrange Tq curve.....to move big heavy cars.
but, build it for Tq and youll get HP. also even with the biggest cams the engine if figting to breath over 6krpm when the piston acceleration/decel rates work against cylinder filling without a turbo helpuing things along.
adding 1.9 rockers would give you a bump in the curve but the stock cam still falls flat at 5500.
3.55 or 3.27 rear 8.8"? hopefully you have the 3.27 for topend and your weight
that nice Tq curve will be more helpfull than a HP peaky motor
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