I would not turn my nose up, if offered a 65/66 or a 68, but the '67 is just a little nicer IMHO
Of course having an original, (as in an original cobra) is akin to having a museum piece. Certainly not something which one would take to modifying in a big way, without effecting the value.
The nice thing about doing a tribute car/restomod is being able to take a little artistic license and make the car, like it should have been made, back in the day.
Some of the things I did to mine
Make all the fiberglass fit better.
Block sand the (raw fiberglass) underside of the hood and trunks (so it looks pretty)
Raised the back spoiler and radiused the arc
Stretched the metal quarter panels just a tiny bit
and moved the inner wheelhouses inboard just a little bit
made the rear brake ducts functional (instead of blowing air on the rear tires)
lowered it 1.5" rear 2" front
plus a plethora of other crap
but I did whimp out so to speak.
I traded the toploader for a TKO
I tired of the old manual steering FE combo, and changed it to power steering
and I am adding air conditioning, next month
It's actually becoming a pretty civilized car to drive (other than having to tow a fuel truck)