Butler usually goes for bigger clearances, like 30+ on the mains, so psi is going to be a little lower than what you would expect. Around 15 at idle is normal for their' builds, and around 50 is normal for max hot on a 60 psi pump. That's why they recommend 20-50w to begin with. 30 at cruise is a little low, but that could be from other reasons.
What kind of pan do you have on there? If it's an OE pan, add a quart and see how it is at cruise. It might be better, which will give you an indication of what's going on in there.
I think you're good, but call Butler, especially if they assembled it.
As an FYI, on a fresh build, always change the oil after start up and break in. Change it again at like 100 miles, and again at 1000, so it get all the crap out that may have been trapped from being open during the assembly. Blows me away when people go 3000 miles on break in oil. (not saying that's what you did)
That crap in the pan from the previous build is from a lifter, without snap rings, and it got hammered out from either a loose adjustment or a lobe going away. Make sure you have adequate preload on this build.
Check your gauge too. Since we're on the subject, what kind of gauge do you have? And where do you take your reading from? If you take it from the back of the block, then definately you're good with the psi you are seeing. (it's roughly 10 psi less than at the filter)
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