When to worry about engine noises?

La 360 stroker solid roller it runs a Hv pump broken in using Joe Gibbs break in after 8k have been using a synthetic with Zinc 15-40 or 20-50 . 75psi cold ,hot idle @850 rpm to provide some oil splash on lifters 35-40 psi 2000rpm and over 65psi . Top end gets fed the via hollow push rod tubes as well as the normal way through shafts Engine has 21k on it now .Better to spend on quality oil and filter than saving a few bucks and risking damage.