I would leave the break in oil in just as long as any other oil. Might want to take a sample if something doesn't sound right or loss of oil pressure.
Adjust valves?
The valves need to be readjusted as soon as it comes up to operating temp the first start. That should be done immediately after retorquing the head bolts.
Let idle then medium speed then high speed?
No, don't let it idle! Especially if it got a new cam and lifters. The engine needs to be run at least mid throttle to full throttle for the first few minutes. Idling causes poor lubrication of anything depending on splash lubrication, as in cylinder walls, cam and lifters, cam and accessory gears, etc.
I like to preset the timing, fill the carb, get everything ready so it starts immediately. Bring it up to speed, check oil pressure, be ready to top up the coolant, watch carefully for leaks, listen for unusual noises, keep an eye on the oil pressure and temperature, enjoy the small of fresh cooking paint!
As for putting it to work, just do what you normally do. Maybe avoid full load, as in a heavy continuous load where the governor is maxing out the throttle and wanting more. Give it an easy job at first, something to get the rings seated before the heavy work begins, if there will ever be any heavy work.
That's what I do, or recommend anyway... Hope it runs well for you!
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Today's Featured Article - Old Time Threshing - by Anthony West. A lovely harvest evening late September 1947, I was a school boy, like all school boys I loved harvest time. The golden corn ripens well and early, the stoking, stacking,.... the drawing in with the tractors and trailers and a few buck rakes thrown in, and possibly a heavy horse. It would be a great day for the collies and the terrier dogs, rats and mice would be at the bottom of the stacks so the dogs, would have a busy time hunting and killing, all the corn was gathered and ricked in what we c
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