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I have a question- does it matter whether I use the smaller passage or the larger center passage for the outlet from the block to the filter? the smaller passage is usually plugged, so is there a benefit to leaving that plugged and using the larger hole in the center instead?

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The center port (big hole) is the return to the engine...
the OD of the filter is always the inlet side, it
has greater area to collect trash... the pic of mine
I used the center big hole (I might not have it right
in the pics,I screwed the lines back on to keep it
from leaking)

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So the large center hole is the return to the engine from the filter.

But which small port is the inlet to the filter? The one that is already tapped and usually plugged as in the pic i posted, or the small one that has to be tapped to 3/8 npt?

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the one thats open is the supply to the filter

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