if aLl out n/a:
go Dohc.
higher comp pistons. can be made custom, theres a shop down the street makes anything. 100 per piston for first run. then 50.
or.... (And some "and")
headers. intake, safc, 370cc, nitrous. u can go pretty nasty with nitrous up to 100 shot if u got the pump and the fuel. colder plugs might be a good choice too.
msd ignition works real well too.
overall, n/a drag is a waste of time. either go turbo. or bigger block
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hydropgrahics! 
ls1......
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