If you have enough knowledge and are mechanical inclined, check out a unfinished project, but be careful, and take along someone that has built one.
But, it sounds like if you're considering a Shelby continuation series or Kirkham
I'd recommend finding one for sale with either a Shelby FE, Keith Craft or my pick, a Big Block Motors (BBM) aluminum 427 side oiler, their magical heads and intake. Mainly because it's a side oiler over just an FE. All need expensive machining on top of just the block cost.
When you research you'll find some real nice Cobra's selling for under 60k, then you can personalize to your taste and make it your own.
Take you time and continue your research. You've came to the right place to start.
Nice Shelby continuation series. No listed price, just "firm". (look at several other pages too)
https://www.hemmings.com/classifieds...#&gid=1&pid=37
https://www.hemmings.com/classifieds...lby&modelFacet[]=Cobra&start=0
Very nice ERA Cobra. They are great cars.
https://www.hemmings.com/classifieds...a/2276196.html
Very nice Kirkham. Keith Craft Alum. 427 Side Oiler 600 HP. (almost perfect for me, except price at 120k)