show quality paint
There is a shop my buddy works for here in OK that actually buffs the floorpans! Mind you, they only do a few cars a year and are expensive. It could be that these shops are more concerned with period-correctness than with show quality. I once read of a Corvette restorer who put drips in the valve cover paint to simulate the way G.M. used to paint them on vertical racks. It may have something to do with the way the factory sent the cars out.?