Resurrecting my old car...am I insane?

[imtheonewhoknox]

OK, so go with me here for a moment - it'll be a mix of a walk down memory lane, and the ramblings of a lunatic, but I promise it'll make sense in the end.

When I was a kid, all I wanted was a Mustang. I had the posters, the Car & Drivers, Motortrends, literally everything with the car in it. I lied about my age to get a job at 14 so I could start saving up money for one, and in 2001 when I graduated High School, I bought a new Mustang. It was a base V6 coupe, which was all I could afford at the time - and I was the coolest...until the dude with the GT pulled up next to me. I ended up trading the car in as my life changed, but those Mustang dreams remained - I promised myself that if I ever had the opportunity to do it again, I would do it "the right way".

Fast forward 10 years an that opportunity was there. I took delivery of a new 2013 Mustang GT and over the next several years built her into my dream ride - my wife actually referred to her as "my mistress" because Id always be sneaking out to tinker, or drive, or both. I adored the car, pampered & babied her. But when we found out that we were expecting our first kid, I knew my days with the car were drawing to a close, trading it for a more responsible car. Broke my heart the day I traded her in, and always have kept track of her since trading her in.
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Then I got a Carfax alert - she was wrecked. A VIN search on Copart showed the extent of the damage...but the engine bay looks remarkably clean!
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It may be an absolutely insane idea - but I want to buy her back off Copart, and use the motor to keep her alive in my new Cobra...

Am I crazy? On a scale of one to "absolutely insane", how dumb is this dream to resurrect the engine and use it as a base for a new Mk4 build?