On your Ford F53 460, open dog house, look forward on the left side, about opposite of the gas peddle. You'll see the OBD 1 connector pluged into a protective shell.
If you need a picture or help with the codes, check in at this link on IRV2.com. http://www.irv2.com/forums/f23/
There is a gentleman called subford. He is the most knowledgeable person I know when it comes to the old Ford F53 460 chassis. The man is brilliant with all things concerning the EEC-IV computer.