All things equal, How much difference

Hey guys, I'm still looking for the right car to build and there have been several options. I have two 70 Dusters, one is an console shift automatic H car. It is sad how this car has been abused but there isn't any rust to speak of. Somebody botched quarter skin replacemnets on both sides and began to make a race car out of it. It has a role cage that has got to go and a motor plate and collaspable steering wheel, all coming out. There's probably 5 or 6 hour of body work to be done on the roof also. I've got good doors, fenders, hood, and deck.

So here's the question, how much more value is there in it being an H car verses say a 318 Demon. Let's say that all things are equal in terms of work for each of these cars. I know the 340 car has value but I also know that Demons are rarer.

What do you all think?