I looked for quite a while and the only reference I could find to the heater motor tape on 67 non-A/C cars was Jim's great write-up on heater motor repairs. He says, " For 1964 thru 66 the tape used was a black masking tape. For 1967 it was one inch wide friction tape."
DeadNutsOn appears to indicate it might have been 1" wide black masking tape.
Amazingly, I can't find one post that verifies which it is.