If you want to build the car and want the maximum amount of flexibility, the FFR is the kit for you.
Plusses- built to handle most Ford engines including the 4.6 mod motor and can be modified easily to handle bowtie powerplants.
Lots of aftermarket parts made for the FFR due to volume of kits sold/built.
Lots of help and support at
www.ffcobra.com to help you with your build (and help spend your money)
Good manufacturer reputation for factory support and service
Original dimensions for chassis, wheel base, body
Options to build the kit from a base kit using a donor to save money, or buy a "complete kit" where you only need to buy a motor, tranny, and paint/bodywork
Minuses-
Not a completely accurate body, but most people not familiar with Cobras will never know
Body needs quite a bit of work to get it ready for paint