Correct Oil Filter for SB

The oil we used is Castrol GTX 20-50W.

I need to look up all the places where there could be internal leaks. How can I tell if I really have a HV oil pump once I get the pan off?

I noticed the 90 deg oil filter adapter has a plug in the end on the suction side. Could I put a gauge on that and be able to tell anything?

I really hate to do this ,but it sounds like we might need to pull the motor out of the car over the Christmas Holidays. (Hope it is warm enough). If it is not obvious like a missing plug I am not sure what to look for.

bwhitejr