Windshield Glass

Sounds to me like the glass shop you asked just didn't want to be bothered. They most likely don't stock that windshield and ordering it in would probably inconvenience them. I got the same treatment from a couple of local shops but I went into one where the girl thought it was fun or interesting to find one for such an old car. She said she didn't think she had ever seen a 1964 Valiant before. She had the windshield the next day. Your windshield should be available from most glass shops.