Found this after reading about the targa rally which we will be doing soon, I then found this mod, downloaded it, Had a play and it was great fun doing the cars on JP's Targa rally stages.
Got loads of cars, Mainly current cars but its got Group B (Well all know and love these!) and Group A8 cars (Ford Escort, Lancia Delta etc)
Thought it would be cool if we could possibly do the Targa rally with the rally cars.
Group B Cars : http://www.rallyworldmod.com/index.php/descargas/categor%C3%ADas/68-grb.html
P.S to install the mod, You need the rally world 2013 base mod http://www.drivingitalia.net/forum/index.php?app=downloads&showfile=2252 , Then you just download which cars you want.