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G5X3/114? R1/114? something in the mid 230's on a 114 should work
Give Futral motorsports a call i'm sure they'd reccomend a great cam that'd amke excellent power, the g5x3 wouldnt be big enough for a 408. you can go much bigger with an iron block.
We actually have quite a few cams to choose from for a 408, and we have a few in deveopment that we're going to try in our 410 cid setup going in our '99 C5. Feel free to call or e-mail me if you'd like to discuss a few different grinds.