It is a mexican Coronet and thats for sure, that hood even here in Mexico is HARD to find. No one would bring a US car then piece it up with the most random mexican parts and then take it back to the US and install the 440, steering column and what ever else. My best bet is some young guy from the US came over the border and saw it sitting in the street rotting away and bought it for a few thousand pesos, some how got it back accross the border and then "hot rodded" it with all the "correct" parts like the 440, auto trans and shifters you see here (oh because this thing was mopar's 1st attempt at manual/auto shifting trans, lol).
On the collectors value/relevance matter topic, i think i've seen a lot of cars in way worst shape restored to show quality. Now if its worth the time or money it all depends on who is looking at it, some people in the US find muscle cars from Australia, Canada, Mexico even more interesting and valuable. For some other people anything made south of the border, nazy germany, the middle east or asia isnt worth a dime and no explanations will make them change their mind.
Like Dartnut said and i quote "It's a labour of love, not the resale value you need to look at when you restore a car.
Barret Jackson prices and hype don't apply here in this case." Bet he'd go nuts and find very restorable this mexican '69 Dart GTS 318 4bbl, 4 speed Hurst shifted basket case my dad is had waiting restoration for over a decade "waiting on it to collect value" lol.