I prefer a base coat/clear coat system.I painted my 71 Charger R/T back in 1991.I used Glasurit single stage then wet sanded and cleared over the single stage then wet sanded again then buffed it out.The paint job is almost 20 years old and still looks like it was painted yesterday.Having a clear coat makes it much easier to take care of and also if you needed to do a repair it is much easier to spot and blend>Most restoration shops are also moving towards base/clear coats.Not by choice but because of VOC regulations.Shops must comply with changes or get fined.I now spray with ICI Autocolor a line that PPG now owns which is used on most European cars.Most paint shops will work with you on a color match but they will probably charge for that extra service.
Sam