loosing oil pressire on hard accel and at idle

Low oil pressure after ran awhile? Mine runs warmed up at 60- 70 lbs constantly. Let me ask this. Does the engine do any smoking? Sounds like when the oil warms up of course it gets thinner. Whats the engine temp say? Does it use any oil? I had this issue in a new small block. Low on power but it did smoke. Found it was the valve job was a nerl job and the oil was leaving headed for the pistons. They fixed it. Ran like a striped assed ape. Answer those questions for us.
Small Block