Almost no oil pressure help

Engine is a 1970 318, yes it's been rebuilt, I have pulled the valve covers and all
I see is fresh clean oil from when I filled it... The rockers appear to be lubricated well. There is no noise at all comin from the engine and I just did the exhaust on it. It's pretty quiet. There are only 25 miles on engine if that. Yes the oil light has always been on since the initial fire up.