[DanEC]

Since we are speculating on this - I saw a couple restoration 428 CJs at Keith Crafts shop a couple months ago that had been run in on the dyno. I assume they were 100% stock but blueprinted. The dyno operator said from memory that they made around 415 HP. I asked how much Edelbrock heads would make on top of the heads on my engine which are basically the same as Cobra Jet heads now that they have been re-worked with larger valves, and they guessed about 30 HP on my fairly mild motor. So assuming your engine was put together with the same attention to clearances and part matching, that gets you up to about 445 HP. With the intake and cam figure another 10 to 15 HP and my guess is 455 to 460.

Dan