$350k to $400k Mustang?

See what unrestored unmolested excellent original BOSS 429 Mustangs go for. The first year Mustang is an icon. It's the car that "started it all" as far as the unknowing public is concerned, so that makes them worth "whatever" people think they are worth. Just because you happen to be a Mopar person has no bearing on anything.
first of all. it's not the first Mustang built. Second, it is restored, not original. Third, it may not be the first one sold, just the earliest known to be sold so far. Fourth, it is a mustang. Mopar fan or not. they had all kinds of glaring problems. and we're pretty poorly constructed.