[olddog]

My rule of thumb is 1.25 torque per cubic inch is reasonably easy to get. With 480 cid that is 600 lb-ft of torque. If you can hold the torque up there to 5252 rpm that's 600 Hp. With tunnel port heads you should not need a radical cam to get there. If you are not going to spin it real high, why kill low end torque to gain a few Hp where you are not going to spin it?