I had Chevy 6's back in the day, which were easy peasy to adjust while running. The last one I did was in a '55 tudor, back in 1968. As I recall, the only real messes were due to being too cheap to install a new valve cover gasket when you're done.
There are instructions for adjustable lifters I used once (can't find them now), spark plugs out, carb blocked open, one rear wheel off the ground, ****** in reverse, adjust two valves per position, helper turns wheel to next position... Well, I guess you don't really need those instructions, but helpful to know which 2 valves to watch per position. Or was it 4 valves per?...I do remember it seemed easier to do one bank complete, then move to the other side.
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"****** in reverse"? That helper must have been a real gorilla! Plus, turning the engine that fast must have made it a real bear to stop at exactly the right position. Much, much easier to put the trans in high!
If you play a country song backwards, what do you get? ......all your stuff back. Ya lame but a good street joke.
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Those are KRW manifold risers and a quote from the KRW catalog states "hunting for noisy valves". "They will give you the inside picture". Not used to adjust the valves but to locate valves needing adjustment.