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where can i get a high pressure spring?



Won't help you.

The high pressure spring sets the MAXIMUM oil pressure. It will not raise you lower oil pressure at idle.

The only caveat is if the pressure relief valve is sticky, taking it apart to install a new spring might loosen it up and get it working. But it won't be the spring that fixed it. There was a batch of oil pumps a few years back that had this problem and I think it was Melling pumps too.



Exactly. A High pressure spring aint gonna help one iota. Its only goning to keep the relief valve from opening until a higher pressure is reached at speed. At lower pressures the regular spring is keep the valve closed just fine.

The pump itself could have excessive clearannce between the rotor and the case. Considering the low cost and ease of replacement on a BB you might want to try a different HV pump, or machine down the case clearance on this one.
But in all probability it is a loose motor. You could drop the pan and plastigage the bearing clearances...