It will depend on the demand, especially in your area, as well as just how ambitious and complete the restoration your doing actually is.
In in some cases, folks clean them up and paint....in some they tear it completely down and rebuild engine and tranny and new hardware....
Either way is good but depending it would change the value in my opinion.
And I have seen that with Wheel Horses it’s similar to Classic Cars. If you go the more comprehensive restore, you will have more into it than the market will often pay.