I have a 359 with 400 big cam with a eaton 15 speed weighs in around 45000 lbs when you accelerate it has a clatter in the valve train temperature goes up. egt runs right 900 and climbs if I stay in it and this is not full throttle. It does not seem to have power that I think it should have. Any Ideas ? Could this be timing or running to lean only time it blows any smoke is if I lug it. We just did a valve adjustment that didn't change anything. I am use to driving my 3406B.