Billy Ard.
A left guard, his time with the Giants coincided with Bill Parcells' Giants years. Ard played for the Giants from 1981-88. He became the full-time starting left guard in 1983 and did not relinquish the job until moving on to Green Bay in 1989.
I have not been able to find any significant pre-1950 Giants who wore 67. If you know of any, let me know.