[Nova Research Project]

Coming in on this one late......

The interior car parts were not usually treated with more that a light dipping in phosphate soap and water solution unless they were visible. This is not the same a cooking in a Zinc (gray) or Manganese (black) phosphate as used on the outside parts. The outside parts had to stand up to several hundred hours of a salt bath to meet spec. The inside parts had to stave off flash rust until there were installed.

You can pick up a phosphate soap mix to spray the bare parts down to keep them from flash rusting. I know Eastwood sells it. This would duplicate what GM did, but then the parts would start to rust within a year. Bare steel paint or Boeshield are both common restoration practices.

Greg