How many of these 65 darts were made??

Value is in the eyes of the beholder. You have a really cool and unusual car. I think it's really neat and has a great deal of intrinsic value. It would be cool to try and find out who the original owner was and look them up in the census. It would tell you a lot about them. It's an unusual combination for sure and there is likely a neat story about its origins. The car is a real sleeper - unobtrusive car that could embarrass a lot of "performance" cars in its day. Have a great time with it. I get pretty tired of seeing the same old combinations at car shows - cars that are thought to have "value" because Barrett-Jackson bidders say so.

There are some cars that are rare because they were ordered in some godawful color combination - that combination is still probably godawful now and that accounts for its rarity, but a 10+:1 compression, solid lifter, four barrel performance engine in a 4 door family car is just cool...