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You're build will have to be somewhat radical to realistically achieve your 500hp goal. The Eboks will also have to be ported as well to achieve it. (suggest Keith Craft's stage II Eboks) I would suggest a 4.25" stroke crank and 10.5 - 11.0 to 1 compression. The cam you'll need to run will bleed down cylinder pressure which will result in a lower dynamic compression ratio. Pump gas (91-93) will stave off detonation and keep the ring lands in place. Scat's setup utilizes BB Chebby rods and can give you a 3.98", 4.125" or a 4.25" stoke.

Dave