It is roller rockers, not sure what the preload is, I didn't build it. Yeah, I was a little uncomfortable with that pressure, but the builder assures me it's fine within stock oil pump specs.
The builder’s is the advice I would listen to above anyone else. If you want to spend money, put a high volume pump and pickup in. You’ll get your psi, to what advantage? I don’t know. If it runs hard and it’s not eating itself, what’s the problem?