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Those cam specs don't check out. With the specs you posted the valve overlap would be 88, not 80. The formula is valve overlap = (in adv + ex adv)/2 - (LCA * 2) = (300 + 308)/2 - (108 * 2) = 88
Maybe you ment the LCA was 112 which would result in a valve overlap of 80 and a lot more streetable.
As for power between 380 and 420 depending on the port job. The L98's are inferior to the vortec heads and with the lift of that cam I'd seriously look into vortecs if you don't already have an intake manifold. As for the intake, get an RPM at least. In ever test so far the RPM intake has made more torque EVERYWHERE compared to the performer.
Then the rear gears... depending on your 6th gear I'd go with at least 3.73's. If it's the .5 OD then 4.10's.
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, Jon
Owner of a Red Sled.
If it\'s EFI I can tune it. Specialize in 82-95 GM (yes Lt1\'s)
\"If you can leave black marks on a straight from the time you exit a corner till the time you brake for the next turn.......Then, you have enough horsepower\" - Mark Donohue 
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