Just a comment re BUBBLE's oil pump gears.
Hopefully, the gears are not too tight a mesh.
Many years ago, at Rolls Royce, we found that some long, external ERW lub. oil pipes were "ringing" and and eventually splitting!
Instrumenting the oil pump delivery showed transient spikes of 600 psi, although the gauge was only indicating 60 psi. The problem was caused by the gears being such a close fit. The solution was to increase the tooth clearance very slightly, allowing a little leakage, which the pump could easily tolerate because of its over capacity.
At the same time, the pressure relief valve was changed from a poppet type to a plunger, using the plunger/bore clearance as a damping orifice.
Reference improving oil pressure by lapping the end cover flat, to reduce leakage.
The Skoda 100 Series engine gear type oil pump had shims between the baseplate and the body. Removing one of these shims, and sealing with Hylomar restored the oil pressure to within the quoted limits.
Howard