I don't believe that the valves or the guides or the prechambers will be in good shape, even if oil changes were performed on a regular basis. The wear is unavoidable.

Naturally, you can certainly reuse a head with 175K on the clock. It just won't perform anywhere near the level of a new engine. This level of performance can be obtained when the head is completely overhauled, IMHO. It's worth the money if you enjoy the vehicle and plan to keep it for a few years.

Naturally, if all you wish is for basic transportation, you might even get away without replacing the head gasket..........if the engine doesn't overheat too badly.

Personally, I need the vehicle in 100% condition. It goes on a 500 mile trip without notice and I want the associated reliablility.