HC110 works fine. Better to use monobath R3 with HC-110 to reduce/eliminate fog and achieve more of the original intended appearance though.
Quall's formula of which R3 is one version is great for old emulsion as it greatly reduces fog and provides a superior negative too. The film in 55 is SO-139, from Kodak. Slow development in dilute developers is not so great.
http://new55project.blogspot.com
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