Flip job!
Well Adam, as said above there are regional factors involved here as well as model preferences and options!! I'd say top of the food chain seems to be the Duster and Demon body style with muscle options, fetching around 10k, followed by 67-69 Darts and Barracudas fetching 8K and then 70-72 and later Darts commanding 7k, followed by 73 and later anything at 5k and taking up the rear right now are early A's at about $4,500....
Now, all of these estimates are for #2 cars, nice running and driving examples but needing to be finished, either unrestored or partially restored. Restored meaning correctly done and not modified to the builders preference!! Add or subtract as conditions dictate...... and of course jmo!!! Geof