Oil or lack thereof

Mo'powr340 said

Have a 69 Swinger 340 that has very little if any oil getting to the left rockers.

Engine was rebuilt by someone else several years ago and hasn't been started until now.

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what is the oil pressure?

oil plug missing???
the one at the rear of the left side oil gallery for the lifters

You can see if its missing , while priming the oil pump, by looking in the distributor hole