That's a Dart custom. . They are nice, its a trim option, the buckets seats, woodgrain dash. I say go for it, looks like it's mostly all there for that price,which isn't a bad deal IMO
Customs are all bench seat cars - the buckets are not original to this car. A Custom with buckets is the A65 GT option (all GTs start as Customs and the glove box door should say Dart Custom). Yes 2 door 1970 Customs are rare - a lot fewer of them made than 340 Swingers. The vin should start with LH23 - the H is the high trim level. If you buy the car and are looking for original Custom trim drop me a PM.
lookd like FK5 paint on that car.. its an awesome color all cleaned up. don't see many customs but it really doesn't increase value because its just a trim package. could be a cool car though so grab it as cheap as you can and run with it..