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There are a couple of conversion kits to convert 385 2-bolt to 4-bolt blocks. Haven't personally done one, but hear good reports.
The 2-bolt will easily handle 700hp, so you must be planning something interesting.
Just a quistion, I believe in high HP engines, I have plasn for all my motors.....all of them include a blower.....hmmmm........maybe I should go to a shrink?