See:
http://members.tripod.com/lyc_42/fordv8/fordmisc/fordmisc.htm Scroll to the bottom for a picture of the Mangusta Weslake conversion. Gurney Weslakes are still around and Gurney still had stock to sell but I'm not sure if he has all the parts required to complete an induction system. There was a GT-40 guy in Cincinnati that was trying to do a deal to buy the remianing stock but I'm not sure if that ever happenened. BTW, a friend runs a Gurney-Weslake set-up in his street rod.
Dan Jones