[82ACAUTOCRAFT]

Rick I don't want to be rude but your power figures are a bit high. Shelby claims their block is good for 1500 HP (This would be an extreme case, a blown motor running on Nitro), Facts are, most street motors put out between 300 and 500hp when run on a proper dyno. I recently saw a guy bring a Cobra with a motor build by a well known engine builder who will remain nameless, the claim was 575HP, the motor dynoed at 375HP and that's not the only case.
Yes, modern aluminum blocks have been enhanced compared to originals but the material itself is much softer than iron no matter what. Threads strip easily etc.