You'll be fine for a while using blue felpro's the race versions, i highly recomend Studs but you already know that, Your 3 tubes should get you by just fine i don't think it will care all that much to tell you the truth LOL, easily over 600hp, Those heads are really good, plus it would be cool to see what it would run with 3 tubes JMO
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D.S.R.E. Your NW Pontiac Street/Strip Engine Builder, Specializing in Cylinder Head,Intake Manifold,and Exhaust Manifold Porting services and Building the Most Efficient stock rebuilds to Hi HP Pump Gas and Race Combinations for Pontiac,Buicks,Olds,FE Fords,385 Series and HP Gen 3 and 4 LS engines!
2006 silvy Z71 4X4,383 LS 600+hp NA
Shared Toy-66 Lemans 470cid by me 537hp 580tq-manifolds, 570hp 590tq-2"headers,custom cam,rpm intake, mild e-heads, Looks stock ;-}
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