For me personally I'd expect to pay at least $1500 less. Cars like this are OK if you're never going to sell them. Even then, get stopped by the wrong cop and see what a nightmare it can be. There are so many of these cars around that a buyer really has no reason to get involved in something that needs explaining over and over. Unless of course the deal is too good to pass up.
When I first put the vintage plates on my elky, I got pulled over on a parkway here in NY. Cop told me my car didn't exist. I had the insurance ID, the NYS registration, and the proper stickers on the window. He wanted to impound the car. When I explained that all these documents were real, he showed me his computer screen that still showed my plate registered to my 76 blazer and expired in 1985! This was 2006! He even said that the blazer had been issued new plates in 1986 and his screen showed those as well. He let me go. Told me to keep it off the road until I went back to DMV Monday morning and fixed it. At DMV I was told they did make a mistake and the cop was right.
Had another incident with my Torino years ago when I put vintage plates on that one. Got pulled over by 2 unmarked "anti-crime" cars. One behind me and one that blocked me by coming out of the side street ahead. Cops with guns drawn ordered me to shut the car off and keep my hands up and removed me from the car. I asked them what did I do. Their response...."You're driving a car with plates that expired 20 years ago let's start from there!" Then when they realized everything was in order, they said they didn't know you could use year of manufacture plates in NY. So yeah find the wrong cop or the right cop with the wrong info and......