Kinda depends on what they painted it with. If it's POR15, unless you have Nitro in your oil pan, it'll never come off. Nothing to worry about. Actually better than raw steel in a lot of cases. You'll never have rust or scale. On a racing engine, though, normally that's not a problem (if you take it apart in the wintertime and the engine isn't sitting there all in one piece for 8 or 9 months).
Take MEK or Methanol on a clean rag and try to scrub it off. Scrape the surface (outside) with a sharp knife. If either lifts, softens or scrapes the material off, it ain't Por15.
It could also be either powder coat or epoxy. Can't say much about either because it depends a lot on how it was prepped prior to coating . . .
Back to square one. Call WYSCO. Ask 'em!
But . . Back when we was racing Jr. Fuel . . We used to paint the whole inside of an engine prior to putting it together. The idea was that the paint literally absorbed or glued down any thing that didn't get washed out after machining. Never had a problem with the paint coming off, but it sure as hell didn't keep the rods inside!