For 67 the vacuum can mounted on the rear apron by the hood spring was the vacuum canister for the A/C like it is for the later years IMHO. In 67 the tilt canister was mounted on the battery tray as indicated in the assembly manual. There are 3 sets of holes prepunched on the assemblyline Battery trays . One set is for 6 cylinder , one for V8, and one for 390. I don't when the transition changed where the can mounted to the back side of the apron under the battery box like all 68,69,70's did. I believe if it was in 67 production it is very late IMHO . I have seen a number of examples in late June that had it on the battery box. They were all San Jose so other plants could have varied . Bob