I don't know how they drive in Supercar Challenge, but in GT5, the 330, XJ13 and Ford Mark IV and '69 GT40 (along with the Chaparrals, 512BB and Miura) all perform much better than they would do IRL. Maybe Supercar Challenge, with it being a bit more of a serious attempt as a console Race Sim, does the job of simulating it more realistically?