How should I start no oil to rockers

Scooper said

Might just be a clogged rocker shaft. Its unusual for there to be minimal/no oil flow at the opposite ends.

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I agree. My 225 had not been run for 32 yrs when I got it.
Did a full rebuild but found that the rocker shaft was plugged with dried out oil sludge. There is a small oil feed hole (1/8"?) through the shaft for each rocker. Mine were plugged. I took the plugs out of each end of the shaft and cleaned it well with a bore brush and solvent, including the feed holes.
Pretty easy to do without getting deep into the engine.