To be honest, my engine makes much more noise than that, and it is perfectly fine.
With high performance engines and old engines in general, you shouldn't expect it to be as quiet as your wifes new car. It just isn't going to happen. In the later years of the 302s production run, Ford actually tried valve covers with dampening material on them to quiet down noise.
Do not run a HV oil pump in a engine with standard bearing clearances. You will have 60-70# of oil pressure at all times, the pump will be in a steady state of pressure relief, and the cam and distributor gears will be under increased loads. Over time, it is likely to actually cause a failure.
lifter preload is .045
While that number is in the middle of what most consider normal, you can run more. 0.060 is still within the recommended range for most stock type lifters. If it is the lifters, that should help quiet it down some.