Ok, the block is a circa-1974 "959" replacement 454. Above the oil filter, there are TWO oil plugs. One large, one smaller. The larger one is toward the REAR of the motor / the smaller one is just forward of that one. This is the first BB I have put together in awhile. All of the older ones were early blocks with only one outlet in that area.
So, my question is, WHICH one is best to use for the oil pressure sender?? I would assume these are for oil-cooler and one must be inlet? I would be looking for which one is the OUTLET. I have been searching, but haven't found specific ID's for these plugs.