I built 2, 572 PSI blown and intercooled motors for my 38 flatdeck Cigarette. 1100hp ea. with 7.5/1 compression ratio and a "mild" street roller cam.
They idle at 500-600 rpm in gear and I have not experienced any trouble with the PSI's, as stated above.
I would go with them again, in a heart beat. If anyone wishes to talk about PSI's, I would be happy to accomodate. I.E. I'm sold on them.