Vortec's with the 170cc intake runner will put you right at 400, and they are really affordable. just be sure to get the ones with the bigger lift capability. the stock ones only go to like .4??. Scoggins dickey sells some that lift over .5?? the part number is SD8060A. If you use them you will have to switch alot of your top end, so unless you don't already have rockers, valve covers, and intake. then these heads would be perfect for the power range you are looking for. If not bowties are another good choice.
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