No spec on the original shim. They used what was needed to make it in spec.
Yes, you can just shim it to bring it in spec. Doesn't matter whether you add shims, get thicker ones.... all the same. I've pulled them apart with the shims on the gear side, and with them on the other end. I don't think it really matters. You're not moving it that much. All blocks and cams are different. Nothing special about needing a bunch of shims. Some do, some don't.
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