Big Block valvetrain issue advice needed

Old Man Mopar said

Listening to your video it sounds like an exhaust leak to me. Possibly a crack at the headpipe and flange...maybe under the wrap? Noise sounds to be in concert with the cylinder firing rather than valve train action. Got a stethoscope with a small metal tube attached?

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Hi, OMM

Video audio doesnt do justice to clacking sound.
Sound is definitely coming from The cam up to valvetrain somewhere.
Honestly sounds like echoing from under intake?

I just want to do all I can up top before I have to do start disassembly.
I will grind suspicious rockers possibly scraping head stock first,
then shim up rockershaft assembly and re lash valves.
Maybe Ill get lucky.

Thanks D.