a 468 with 6x4 heads is an awesome combo, my 463 is ending up at just under 9.5:1 with 96cc heads, you should remember when you put a 4.25 stroke crank in a late block like yours will add a lot stress, 468 is a better way to go but i would recomend an earlier block for a 500hp build, 375-400hp would be getting iffy IMHO, the heads will need porting to hit 500hp for sure and Jim at CVMS aka Mr P-body is one of the best at putting together one of these setups, I highly suggest talking with him before you decide on anything because he can point you in the direction you want to go and he can build one of the best engines out there, JM2C
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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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