71 Duster 340 Inviolet V-24 How Rare??

Whats the best way to go on the underside. Matched Paint, black or undercoat?
This looks to be a factory undercoat car but want to do whats best for retaining the value. Sending it to the blaster in about 2-3 weeks. They provide an undercoat service when the car its done blasting. Just don't know if it would be better to color match it. Any Opinions on this? Thanks

I think you really should go back as close to the fender tag as possible to increase value. So even though I don't care for undercoating I would probably use it if it was me. I would however document the entire restoration with a lot of pictures including the condition of the underside without any coatings applied and the process you used to restore the underside back to factory original condition.

You can leave the color matched over restored bottom sides to the restro mod guys and the clone cars. IMO:D