I’ve repaired crank snouts with hard chroming, but I am not so sure it would be the best solution for the rear main seal area. I’ve read that hard chroming creates embrittlement in the base metal being plated. Not a good situation considering all the power is going through that journal.
I never had anything spray welded. It sounds like that may be an alternative. I was also thinking about turning it down, and running a rope seal.
This is a 331 hemi.