Expert opinion needed on h-code dart.

Morning all,
I'm looking for some opinions on a car that I might be trading for in the near future. I'm not new to classic steel in general, but until now, I've never owed any classic dodge's so I could really use a hand and some opinions before I make any decisions....

The backstory is that I have a built up '78 ford bronco that I got in trade. It's a nice rig, but not something that I'll ever get any use out. Right now I'm entertaining an offer to trade for a '70 H-code dart. The car seems pretty solid except for bein in dire need of paint and undercarriage detail, and the fact that the original 340 has been swapped out for a 360. I can tackle the paint and body work myself and get this car into decent shape, but since I don't know a lot about these cars in general, I don't know if I'm looking at a diamond in the rough, or just a dud... Any opinions about the value of the car, trouble areas, or collectibility of the car would be welcome.

Anyway here's the CL add for the car. I've spoken to the owner several times and so far everything seems to be above board. If anyone wants, I have more details and photos on the car.
http://farmington.craigslist.org/cto/3420695178.html

thanks all
Author: Hal9000