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you make your power in the heads, spend money there. have the block cleaned up and if it needs to be bored, have them bore it. to get to 500hp na, you'd be better off with a 383/396 crank imo. head flow should be in the low 300's at max lift. compression ratio should be around 11:1. really just gotta talk to people who do it every day and see what they say works best for you.
power is made in the top end.
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