I didn't read the entire thread, but I did see someone mention "resale"
I'd rather see someone make a decision like, 427 Side Oiler or 351 Winsor, based upon what jazzes them rather than economics.
I equate this to the "Harley vs. Honda" syndrome.
If you've always wanted a Harley Superglide don't buy a Honda Shadow. The latter may look like a Harley and make more economic sense, however, an hour after you drive the Shadow off the showroom floor you'll either be kicking yourself in the ass or rationalizing you decision until you sell it and buy the Harley.
Harleys, Cobras, et al are toys with little practical value other than providing pleasure to their owner.
Research the history of the original Cobra, identify the reasons why you really want one (like having a big nasty 427 stuffed into a ridiculously small car
) then find the kit / options that match your expectations.
That's it.