I can think of a lot of other things to do with 450K than that. For starters, it's 35 year old technology.
Will no doubt show up at Barrett-Jackson where some fool will pay to enter the tent, be fed a bunch of complimentary cheapo drinks (gin and tonic made with no name gin poured out of a gallon plastic jug with grocery store brand tonic -- elegantly served in a plastic cup), then start throwing money around to impress that brown haired woman who nuzzles up against you as long you're bidding. Of course, once you've got the car -- she takes off -- and the bill, complete with 15% commission charge -- is yours!
Don't get me wrong -- it's an awesome car. But you're probably better off commissioning a new from the ground up clone that will be just as good -- and a heck of a lot less. Won't have the pedigree, of course, but do you really need it? Then again, you could go and get a new Z06 and blow the thing into another zip code.