Update: So I ordered a different brand of AN fitting from Summit to replace these 2 with. These are low pressure "return lines" for the power steering fluid reservoir.Apparently the threads work fine but something is wrong with one of the sealing surfaces.
They seem to seal up fine. Filled the system yesterday and no leaks today.
Those other fittings I ordered/used originally must NOT be AN style flares. Because they DID start to create an indent in the AN male bung the more I tightened them up. These new fittings seem to seal completely.
Problem resolved. Onto the next system to check: Hydraulic Clutch setup. Then onto filling brake fluid and bleeding brakes. Then to hook up and adjust the Lokar emer brake cable setup.