What does the gross valve lift calculate at? What I see with many with these good flowing head builds is not taking full advantage of the higher lift flow capability at .600 plus. My heads flow 314cfm at .600..with a 236/246 dur ..391/.400 lobe lift cam with 1.65 Harland Sharpes at 10.8 to 1 compression. This combination has produced well over 600hp in dyno tests by the head porter. I think the limiting factor is the dual plane intake for a true 600hp build in the OP case. The build is easily attainable but make use of the higher lift flow available,get the valve lift in the 650 to 670 range, use available valve spring packages to control higher rpm use and its there.
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466 Mike Voycey shortblock, 310cfm SD KRE heads, SD "OF 2.0 cam", torker 2
373 gears 3200 Continental Convertor
best et 10.679/127.5/1.533 60ft
308 gears best et 10.76/125.64/1.5471
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