The 47-54 Factory Assembly Manual also has some pictures of the RPO 237 oil filter installation, though they're not much better than what Tim posted the link to. That picture of the block is excellent though. The holes are labeled correctly. The hole for the outlet to the filter is also where the oil pressure gauge sender goes.
I had forgotten about the oil distributor on the left side of the block. On the early low-pressure engines, this oil distributor fed oil to the top of the engine through external tubing. On later low-pressure engines, this distributor was eliminated, but the block still had provision for it. The hole was covered with the plate that Tim mentioned above. All evidence of the oil distributor was completely erased from the full-pressure blocks (though I too am not positive about this on the '53 PG block).
That tech tip for full-pressure oiling is really for full flow oiling.
