Low oil pressure, high oil temp?

This spring, my club bought a 1973 200 HP Arrow with about 500 hours on
the engine. Shortly after we bought it, we had to replace several
cylinders and one piston (I'm not sure of the details of why they needed
to be replaced).

The oil pressure always indicates at the low end of the green arc
(almost into the yellow) and the oil temperature is always at the high
end, usually just barely below red line. We keep the oil level between
6 and 7 quarts, and use about a quart every 3 or 4 hours of operation.
If it ever gets below 6 quarts, it runs even hotter.

The maintenance guys say there's nothing wrong, insisting that as long
as the gauges are in the green arcs, there's nothing to worry about. In
my mind, being constantly just shy of redline, even if it's still in the
green arc, can't be a good thing. Should I be concerned?

We've got a 180 HP Arrow which always operated with the oil pressure and
temperature needles right in the middle of the green arcs. Do the 200
HP models just normally run hotter?