With my old 302, I would run around 35-45 psi at idle and up to 65 or so at WOT. That was with the stock pump and same gauge that you have.
A good friend of mine has a high volume pump and runs in the 80's at WOT, but his idle is a little lower than what you were experiencing - somewhere around 50-55, I think.
My 331 will have a Melling High Volume pump, so I can get back to you in a couple of weeks with my numbers, if that would help? Just let me know and I can email you.
E
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1991 5.0 LX Coupe - 40,750 miles
331 cu. in. / Tremec 3550 / BFG Drag Radials
12.22 @ 114.31 mph - w/1.89 60'
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