I am looking for information and thought this would be the best place to find it.

I have a neighbor who owns 2- 75 Chrysler New Yorker Broughams. He and his wife are looking to sell them. How can I find out how much they are worth.

This is the information they gave me: 1975 CHRYSLER NEW YORKER BROUGHM 440CU.IN. ENGINE. ONE IS COMPLETELY ORIGINAL INCLUDING ENGINE. THE OTHER HAS HAD A FEW ENGINE MODIFICATIONS. ALL NEW YORKERS ARE FOUR DOOR.

Thanks for any help.
Patricia