I agree with Ron,
Definition of accurate is paramount!
Interior? (Gauges, dash, switch's, seats, pedals etc....) Smiths and Lucas = $$$
Suspension? (SAI style versus other engineered type) SAI versus ERA is night and day.......
Frame? (Box frame versus 3" or 4" tubes) Round is accurate..still vary in design FFR, KMS, SAI, HiTech etc...
Body? (Ally versus glass and shape) Obvious....
Motor/trans? (Date coded) Accurate displacement and date code will cost bundles....
Wheels? (Mag versus Ally) Ally wheels can be $1000 however Mag wheels will x4 that price.
Accessories? (Mirrors, wipers, latch's etc....) A standard rear view replica mirror can cost $30 however a Talbot will be >$150
Each step taken towards an
accurate 60's car will cost $$$$$
There is no cheaper accurate cobra under my definition......
As Mickmate and I discussed in 20yrs the accurate bar will be set by the 4000 and 6000 cars, might therefore be a great starting point unless you start a custom one off build.
Best of luck!