OMG, you shimmed the thrust plate??? If you remove this cam and inspect the cam bearings in the block, it'll indicate the health of the engine. Worn, pitted or grooved brngs will indicate the need for a rebuild. The cam bearings have a large impact on oil pressure.
If you're lucky, you can replace the thrust plate with a new one and be OK. I would check cam, fuel pump eccentric, timing chain/gears, distributor gears, lifters, and top end for damage or lack of oiling. Carefully cut open oil filter and look for metal in filter.
You running an adjustable valvetrain? What springs are you using?
hope this helps
robertg
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