I made a big mistake myself recently. I identified this taxicab as a 1968 Ford Custom:
http://www.imcdb.org/vehicle.php?id=488311

Now, I think it's actually either a 1969 or 1970... and I'm leaning more towards the '69.
http://www.oldcarbrochures.com/static/NA/Ford/1969_Ford/1969_Ford_Full_Size_Broc- hure/1969 Ford Full Size-20-21.html


Adding that second link is a pain in the ass.