Hey what about GPL? A few years ago the mod team came out with a GT mod for Le Mans cars, set in 1967 (naturally). Combined with the Le Mans track (also circa 1967) it's a really fantastic sim. Drive everything from the svelte Ferrari 330 P4, or the Lola T70, or the Mirage, or the brutal Ford Gt40's (220 mph down the mulsanne!)