71 Duster 340 Inviolet V-24 How Rare??

if you are shooting for a restoration , then i would take pics and re-create what is undercoated and what isnt. if you are going to drive it , i would undercoat the whole underneath. my duster is still the way it came, only the rear wheel wells , front wells and outside front frame rails are undercoated. then entire underneath is a combination of primer and body paint.