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If the oil pump has oil in it, it is probably pumping.
Why do you believe there is no oil pressure?
I have a gut feeling you have plenty of pressure but whatever gauge you are looking is not working.
If you run the engine for 30 seconds and then remove the rocker cover and there fresh oil sitting in the head and all over the cam shaft and rockers.... it's pumping oil.
Why is the oil so dirty? If you put in 5 quarts of fresh oil, it should be very fresh looking?
Gnarls.