The tail lights and steering wheel prove it to be a 70 or something the 68 had smaller tail lights and a different wheel. The 68 also had the spare wheel sitting flat in the trunk and the door locks had gear wheel type actuators.
Please redo the interior to its original glory of maroon vinyl with pleats. I used to have the complete original air filter housing, hood tension rod, radiator and overflow bottle for a 1970 M 1500 - sold it to a guy in Lahore..