C59A Oil filtration circuit question

[Ziggster]

As I get closer to getting my engine completed, among numerous things, I started looking into the external oil filtration circuit. As the engine was in pieces when I purchased it, I have no idea how the oil filtration circuitry is supposed to be put together. My block has three openings on the bell housing, which from what little I've read seems to suggest a "full flow" oil filtration system. This would probably make sense, but I also have a threaded boss on my oil pan. Any ideas?