The amount of road-course qualified NASCAR drivers is actually staggeringly high.
Tony Stewart was a karting champion before going into sprints, and regularly contests the 24 Hours of Daytona.
Dale Earnhardt Jr. regularly used his Chevy connection to get into rides in the C5R Corvette in the American Le Mans Series, something he started to do with his father at the 24 Hours of Daytona (in fact, that first year at Daytona, Earnhardt & Earnhardt finished 2nd in class).
Casey Mears is oftentimes a substitute for Kenny Wilden of Michael Shank Racing in GARRA Daytona Prototype competition.
Bill Elliot and Lyn St. James were teammates for two seasons in IMSA GTO competition in the 80's.
Terry Labonte has a class win at the 24 Hours of Daytona in IMSA GTO.
Richard Petty was a dominant driver back when NASCAR raced at the old Riverside road course in the 60's and 70's.
Herschel McGriff qualified his 1976 NASCAR Dodge Charger 11th at the 24 Hours of Le Mans.
The list can go on and on. So how about doing something constructive like, I dunno, reading a book, before you go flapping yer yap about just who has road racing talent.
Terry Labonte's 1984 24 Hours of Daytona class winning (6th overall) Camaro.
Bill Elliot's IMSA GTO Roush Mustang (here at Watkins Glen).
Earnhardt & Earnhardt Jr.'s C5R Corvette at the 2001 24 Hours of Daytona.
Tony Stewart's Crawford SRP1 at the 2002 24 Hours of Daytona