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did you put in a new cam? bored out?
I pour oil over everything, if you have it together spray some oil in the cylinders, not wd 40. but oil.
I pull the oil pressure sender and use a garden sprayer to pump all 4.5 quarts into the motor, oil filter, ect.

new cam, says 20 min at 2000 to 2500 rpm. new rings are the same.

but on the other hand I had a old crusty friend that said a well built motor needs no break in, drive it like you are going to drive it.
he then started a rebuilt race car motor and held it at around 8000 rpm, it was so loud and shait was spinning so fast I backed out of the way. I get afraid of closed spaces with stuff spinning that fast. he was checking the timing during this. when he let off, it just dropped down to a blubb blubb blubb of a huge cam. I really don't know the rpm.. but I had never heard a motor rev that high before. oh it was a chevy small block, I don't remember the size.
I do remember that the carb looked like it should have a flush handle on the front of it!!!
his motors won races all the time. he would not build your motor unless he liked you.