I love '66 Barracudas and I gotta tell ya the car is probably worth the price but mostly as a parts car.
It just will not be worth the cost of fixing it.
If you really like this car just look for one in better condition - it will save a lot of time and money.
Here's a good tool to research what a car might be worth http://collectorcarpricetracker.com/auctions/make/Plymouth/model/Barracuda/years/1966-1966/