I. Any seem to find the freeze plugs? Are they threaded?

 

there is a threaded plug on the back of the block, above and to the left of the oil filter boss (from driver's seat perspective) that opens into the water jacket. not sure if it technically counts as a freeze plug but it's the closest thing to one on those engines.

 

Okay awesome! Do you know what the threaded bolt directly under the oil filter is, it has a flat hexagon socket? And thank you very much

 

pretty sure that's oil supply from the filter to the crank and balance shaft(s)