I'm not seeing enough oil flow to the rocker arms, although it's probably going to increase at cruise RPM. The engine also sounds too noisy, like somebody is using some sort of water-thin oil like 5W-30 or similar instead of something with enough physical thickness to provide a cushion between the moving parts. These old engines just weren't built with the sort of tight tolerances that make ridiculously thin lubricants necessary. What was considered to be "normal" oil clearance in a brand new engine 50 years ago would be considered to be "worn out" on one that rolls off an assembly line today. In my decidedly biased opinion, anything thinner than 15W-40 oil is too thin! Those thin, high-flow oils will prevent proper oil pressure from building up to anywhere near "normal" on an old stovebolt, and the engine will sound like it's beating itself to pieces (because it is!)!
Jerry
