Need help assessing this 1965 Dodge Dart 270 4-dr sedan

1 - looks like a square back alt. not a problem (may be a good thing), just not original.
2 - the motor is blue. also not a problem but, is it the original motor? been rebuilt? is it a 318 or ?
3 - are you willing to find out it needs some work and how much do you want to do/learn? are you going to take it to a shop for everything? gets expensive. if you can afford it, that's awesome, but if the A/C doesn't work, that can get pricey. if the trans needs a rebuild, more $$. you're going to find things that need work
not trying to dissuade you, just be ready to spend more than you initially think and expect some frustration with the learning curve.
read through @DentalDart's thread and enjoy the ups and downs of jumping in with both feet Dartin for Divorce

i'm not trying to sound too down on the deal, i hope you decide to buy it and have fun with it

good luck

edit: personally i'd go $2500