Timing Chain Tensioner 318/360

I did some more checking; seems this is a big issue with Ferds. The conventional wisdom seems to be:

1) with a roller cam (usually steel core), you need the hardened plate.
2) with a cast iron core and cast iron timing set, non-hardened is fine.
3) with a steel timing set, you get wear in the plate, hardened is needed.

opinions?