Any Rally driver!
Put a rally driver in an F1 car, shifter cart, NASCAR, Sprint car or Funny car and they will do fine. Put any of the other drivers in a WRC rally car and they will be dreadfully slow or crash on the second corner.
Way back in the 1980's Henri Toivonen lapped his Lancia S4 Delta around the Portuguese G.P. track in a time that would have got him 6th position for that years race... in a rally car!! French housewife and Rally driver Michele Mouton smashed the Pikes Peak hill climb record in an Audi S1.
Bring back Group B!!!!
When Henri tested for the March F1 team he bested their #1 driver by 1 second per lap in the March F1 car!
Jean Ragnotti anyone? Here he is at the 95 Rally du Mont Blanc, driving the tits off a front wheel drive, 2.0 liter, normally aspirated Renualt Clio Maxi.
http://www.youtube.com/watch?v=6u22Np-GH8Y
Marcus Gronholm? Check out the airborn corner 17 seconds into this vid when he was testing for Peugot in 2002, Finland.
http://www.youtube.com/watch?v=jIV5vp-ktZA
After Rally driver's I'd say that the biggest talent pool comes from carting and sprint cars.