15 years with the wrong belt routing

I presume it used to be an AC car? The set up for PS and water pump is stock for an AC car. Is that a third groove on the crank pulley that I spy?

Yep, used to be a slant six car. When I was 17 we pulled the engine out of a motor home in a field. No clue if that motorhome had AC but my 17 year old mind wasn’t thinking about anything besides getting a V8.