I won't say that you don't have an oiling problem, but your oil pressure is not likely the issue; that is typical Chevy, all the way. Most Chevy's oil pressures run that way, and it is just fine; as the engine speed increases, loading on bearings and friction surfaces increases, and you need more oil pressure, but at idle, everything is relaxed, so to speak, and the pump slows down and pressure drops off. As long as it acts that way, and does not drop below about fifteen psi at idle (an arguable point for some), or go over about sixty psi (again, arguable for some folks) at speed, for a daily driver, you're good. As to your valve train noise, that bears some investigation; maybe a cam bearing installed wrong so oil is not getting to the lifters and pushrods and upper end , or just some "assembly junk" plugging up a pushrod . There are a lot of little details that could be causing it, even just needing re-adjusting after break-in.