Your first stop should be ERA in CT, since they're in your "neighborhood". They do the 289FIA Cobra, 427 Cobra, and GT-40 replicas. Here's their web site:
www.erareplicas.com
Pick your poison: 427 or 289 FIA, and then on the ERA web site you can drill down to the pricing of the basic kit and the options. This web site is full of stuff to kick off your Cobra research.
Dangerous Doug