Just a ball park idea will do.

well its a slant car, but since it's nice and has a 340....id say 'and i really like this body style'...$6500-$8500....the economy is ehhh....

I have a similar car only it's a 68 Dart. Original /6 blah, blah, blah. that's what caught my interest. The idea that what you have is only worth 6500-8500 isn't too real. Recently a BB Barracuda originally a 318 car, of the 67-69 range sold for $5800 at our local show & swap. It was still needing paint and interior, but the motor was fresh. I was pounding on my friend , who was looking for a car to get this one as it was a killer deal. Unfortunately he missed it buy about 5 minutes. Yeah, it was a clone. But it was all there.
Yours is intact, clean, pretty and not needing anything other than a warm place to sleep at night. IMO it would be worth the 8500 IF it still had the /6 in it and it was in the condition shown. And that might be a low ball price there too. But with the EFI, a minimum $2K addition not to mention the time involved installing it (done it!), modifying for it, and all the other incidentals, I'd say closer to double that number.
A recent 71 Demon listed here for $7500 wasn't as shiny, but was all OE except the owner had dolled it up to look like a 340 car as it was really a /6 car. It too was so complete. It was well worth the money for it too. Look at the for sale section and get an idea. 6500-8500 is way too cheap unless the guys have shown up to break your legs and you need the money ASAP. In that case, I get it.