The cost... it depends.
What engine and which transaxle? Carb(s) or EFI?
My 289 with Weber IDFs is coming in around the $10,000 range. I'm also getting a rebuilt ZF which is $7000. Air conditioning is another $3000. Total cost for my car is $80K+. You can pay more or less depending on how you decide to build it. And don't forget the sales tax, which they're going to want to collect when you go to register the thing if you can't show them that you've already paid it.
Oh yeah, then there's the driver upgrade option: if you haven't had any high performance driving training (e.g., Bondurant, Skip Barber, or even NASA or SCCA), then (IMHO) you should factor the cost of one of these schools into your budget when you think about buying one of these cars.
[ July 14, 2002: Message edited by: Steve Toner ]