My friend has a 62' Fairlane with a 302 (not a crate motor) with upgraded cam, intake, carb, distributor... anyways we were driving home from school when he asks me what this rattling noise, i tell him it sounds like a broken exhause hanger. he also tells me of another mechanical problem, when he punches it will rev to about 5,700 rpm then slip inbetween gears and not shift until he lets off. so we did a wot and it revved past 5,700 rpm and by the time we roll up in my drive way its making a horrible noise coming from the drivers side rocker area, i could feel the vibrations from the rockers. he says the other night he checked the rockers and said everything was fine? is this a bent push rod or what? or could it be needing more adjustment?