Just realized I might've done a stupid thing...

If the motor's still being assembled - now's the time. I think you are about 10° too long ont he duration, plus that line of cams is not going to give the best vacuum because you bought it for noise. So the choices IMO are replace it with something else, or ditch the power brakes. I honestly can understand why a muscle car needs power brakes. I don't like them nearly as much as manual for pedal feel and controlled braking. Just me tho...