The Lightning's GT-40 351 was never a factory option in the Bronco,but I've seen a few with built-to-Lightning 351 specs in late-model Broncos. I remember about a year,maybe two ago,one of the magazines had a 1990 Eddie Bauer featured, which had it's stock 351 turned into a GT-40 351,and it also wore a supercharger on it.I forget which magazine it was, but I remember it showed a B&W picture of this Bronco smoking the rear tires!