318 Duster Rebuild - pros and cons of keeping matching numbers

The engine runs great but it drips oil like crazy. It was rebuilt in about 1990 - approximately 70K miles ago. It has to come out for the restoration work and it only makes sense to me to spend the money necessary to get it fixed professionally while I’m already paying the labor to have it pulled and re-installed. I appreciate the advice and references…. I’ll continue to read additional posts and I will follow up on references provided.