Gabriel........whattza matter, don't like gittin' yer little pinkies dirty??? What is wrong with the original canister oil filter scheme??? It's good enuff fer Mercedes Benz, I buy a M/B oil filters.
The spin-on conversion block attachment requires the oil be fed from the top front of the block attachment adapter. Ittza really a fault of the spin-on filter internal design.
As fer the "T" on the block, that is part of the "feed" to the oil pressure dash gauge ...and... to yer oil filter. Cheap shadetree mechanics, pinch-off the feed to the oil pressure gauge, stedda replacing the $10 gauge. 'course many shadetree mechanic have never seen an oil gauge on their BelchFire-V8, just seen an idiot lite. .......oily Dell