Are you looking for a stack EFI system with eight throttle bodies? If so, check out http://www.verycoolparts.com/. Roaring Forties also sells a Motec stack system for their cars.
Lots of people do - you'll find them on pretty much every GT40 replica made and from a variety of companies. It isn't something that has been discussed a lot but a search might turn up some threads.
Ron