Well, per KK's info on the Mellings, a 72 psi spring would be standard in either the HV or standard pump. Push the RPM's up to 2000 or so and see if it rises much more. The idea is to see if the pressure levels off versus RPM in the low 70's range.
If this is a new pump, it may be tight enough to push the pressures up. BTW, the oil will take considerably longer to warm up than the cooling system. So it is hard to say how warm it really was in your test.
What were your main and rod bearing clearances? And did you check rod side clearances to the sides of the crank journals? Oil filter setup and brand/model? Hydraulic lifters?
It sounds like the oil pressure is getting to the whole engine OK (at least through the whole right gallery), if you got some spewing on the rocker shaft.
