noise on the top end is valves, rarely seen a rocker have a problem. as far as the cam goes, its hard to inspec it in these motors.

you need a special tool for adjusting the valves, pictured below. it shopuld be .007 on intake and .009 on the exhaust. jam nuts should be torqued to 13 ft/lbs.

the head should be torqued, and the engine should have sat overnite. no worm motors for adjusting valves.