valve noise

OK so something in the top end sounds like marbles rolling around here is where I'm at. B303 cam new Scorpion 1.7.2 rockers new Pushrods 6.250 comp cams hardened new Heads aluminum new Upgrade springs 5.50 lift is what they are rated for Lifters ford racing new OK so I soaked the...

my 66 coupe, 351W has a tapping sound that we can't seem to cure? like said its like a fast sewing machine sound and to cure it we've redone the cam/lifters/roller tip rockers and adjusted the valves several times? it's a comp cam (hydraulic), trick flow roller rockers 1.6, alum heads, edelbrock...