I have a solid firewall from a 64 Valiant with a V-8. The only difference in 65-66 is a slightly larger electrical junction and this would have be made a little bigger in the square opening. It could be used on a 63 for more room for installing a V-8. If used in a 63 one would need the 64 and up windshield wiper set up. $100.00 plus shipping from El Dorado Hills, Ca. Greyhound would be most economical way to ship. PM me if interested.