knuckle knocker: I have found it useful to turn the oil pump with a drill and a common screwdriver shaft. I just used an old screwdriver that had a bad handle and cut the handle off. Use the biggest one that will fit in to the pump. Turn the pump to see where you have flow and where you don't. I found a clog in the line from the cam galley to the head. But my 235 is older and that line comes off quite easy. When I took the bottom fitting off and turned the pump I had oil. So that made it easy to track the line to the head as my problem. A bit of cork from a pan gasket was what caused my issue. Lucky for me I had the valve cover off and could see that no oil was coming up to the rocker arms. No harm to the rockers and shaft so Lucky me. You can pull the rocker shaft off to confirm oil to there with out too much trouble. Just an idea that won't require running the engine until you have oil where you want it.

Steve H