Mar, 40 PSI on a hot idle is excellent. Should be 70 as the RPM goes up.
99SS, pretty much, but tolerances will also affect flow. The looser the clearances the more oil you can move but at lower pressure. High flow = low pressure and vice-versa. The problem with putting a high volume pump on an engine that isn't built for it is on the suction side you created a larger restriction if you keep the 3/8" pick up, and on the delivery side where is all that oil going to go with tight clearances? I like a little extra oil pressure on a street car because I think you would get a stronger spray as it squeezes out of the rods and that might provide better lubrication for the cam at low speeds. Also having the oil present at the journal oil hole with more pressure might float the crank a little better. What high oil pressure does do is rob power and put a strain on the drive, so too high is not good. Just use the black 70 lb spring from MoPar and you're good to go.
