318 power?

HP2 said

Yes, I've been thinking about that, but should the pressure really be so high at the filter then?
My friend who built the engine sadly passed away in November so I can't ask him. That's one of the reasons the project was put on hold.

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Oil is drawn from pan, through pickup, to pump, through filter and oil adapter. The pressure is at the other end of the journey through the motor. If you are getting a good draw from the pump and the pressure is high after the pump. you have a restriction some were in the motor. Plug up oil passage somewhere or as I first stated, check bearings.