The pump in the SBC is an high volume BBC pump. It has a relief valve that when the oil warms up it opens at 45. What you describe tells me it is an healthy system. My van has the same pump in my 383/350. It starts and goes way up. At idle it is 45, at high rpm it is 45.
When I fear oil starvation, I watch for pressure drops. Not jumps. A small block does not need high pressure, nor really high volume. I just like the high volume pump.
It sounds like you are like me. I get the willies on some things. In reality, if you have that pressure at idle, and at high speed, I would not lose an ounce of sleep. If you find trails in the oil, or it disappears, or drops to 0 at cruise, or drops while accelerating, I would definately freak out.
Steady pressure off idle is a good indication to me it is working as should be. I have the same pressure as you do in mine, and I feel real good about it.