I think you are both describing showing, in general, the same thing:
https://www.stovebolt.com/techtips/engines/oil%20filters/inst13.jpgOil flows in a hose from the rearward port in the block into the upper/outer portion of the filter canister, and it then flows through the filter element into a hole in the central tube, and out at the port at the bottom of the filter through a hose that connects near the middle of the block.
In general, that is the same as on low-pressure engines and high-pressure engines, except for full-flow oil-filtration on 58-63 261 engines.
On full-flow-filtration 261s, the oil flows from the large forward port in the block, into the top-left of the filter canister and then out top-righ of the filter canister towards the rear of the block. As I recall, the oil pressure fitting in the upper-rear fitting on the canister (I'll check tomorrow).
