When to worry about engine noises?

My engine is running great and pulling hard but it makes some noises that I don't like so I would appreciate any input on this.

I have about 1500 miles on my Blueprint engines 408 stroker. This is a hydraulic/roller engine, Magnum block with Edelbrock aluminum heads and 10:1 compression. It does have forged pistons (which may be relevant to the noise issue...).

I ran their recommended/branded break-in oil for the first ~700 miles or so, and I have run their recommended version of Shell Rotella dinosaur oil ever since. I am on my second change with that stuff...so the thing has never been low on oil nor has it ever had old oil in it. It has seen nothing but Shell 93 octane gas. Timing is set as recommended (all in at 34*). The engine has yet to be flogged, largely because the Radial T/A tires won't let that happen. :D

The oil pressure runs lower than my old Magnum 5.9. When fully warm, it hovers around 40psi while cruising. At idle, it drops down to close to 20.

When running, especially at idle, the engine makes some clattering/clacking noises. It almost sounds like it has solid lifters. It's noticeable from inside or outside of the car.

I called Blueprint engines last summer to ask them about this and they said that their Chrysler motors tend to be mechanically noisy and not to worry about it. They also said that the oil pressure was normal.

Would you be worried about this noise? When do you know it's time for a tear down?
The engine has a warranty but the last thing I want to do is actually use it.