Here's a picture showing the output to the filter and return (input back into the block). If you wish, you can plug the center hole in the block (3/4 fine thread) and directly above the output you'll see a 3/8" pipe plug that can be used for the return. Also be advised that the output to the filter is not tapped. You will need to tap it to screw a fitting into it. It's a pretty large hole to begin with that requires a 3/8" pipe fitting which is pretty hard to get to fit due to it's real closed proximity to the bellhousing area. For that reason I used an adapter that screws onto where the filter normally goes. If you do it this way look the adapter over real close as mine was pretty rough inside which slows oil flow. I used a carbide bit and sand paper rolls to polish the openings to help the oil flow better. Also look the oil filter mount over real good for internal burrs and sharp edges that can slow oil flow.