See, this is all a lot of my thinking, and after reading up some on the AAS, there may be a way. Bear with me.
(Grabs book)
What we know as the Cup series started as Strictly Stock in 49, ran eight events, and proceeded to surpass the Modified series by 1950. The first race was in Charlotte, was sold out at capacity of 10,000, with 5000 rumored to have turned away. Race trim was protective screening, a number on the doors, and tape for the headlights, something I myself have yet to understand. The car starting 2nd was a brand new car that the driver, 2014 HoF inductee Tim Flock, had talked the owner into letting him race it. 200 miles, and one disqualification later, Jim Roper was declared the winner in a bone-stock Lincoln.
(Book closed)
It doesn't have to be a national series, I'm thinking about 8-10 smaller geographical regions, but reviving this idea is what I'm thinking, and in almost every sense. Take those cars you see on the road and put them on the track as close to stock as you can get without killing someone. Engine, transmission, rear-end, even road-legal tires.