[SteveR]

Another thing to keep in mind is that 600hp on a n/a small block is pushing the limits using pump gas and no power adder and keeping it under a ridiculous number cost wise. The very loose general rule is 2hp per cubic inch on a big block n/a all out race motor. Thats pushing the limits. NHRA Pro Stock motors are 500ci and make about 1300hp, but I don't think a $150,000 motor is in any of our budgets. Small block motors are a lot harder, and are roughly 1.6hp per CI. Thats 612hp on a 383, so its doable, but that'll cost you a lot.