I copied Bob's attachments, cleaned them up, and add a "ballpark" reference measurement (5 5/8) from the fender/hood edge to the center of the antenna hole. That is a measurement taken from my 66 K Fastback. Bob's attachment is a Ford Service drawing to add an antenna for 65 thru 68 so that measurement should be very close. My drawing is a copy of an aftermarket document for 65-66 antennas. In comparing my attachment and Bob's, it looks like the hole is about 1/2 inch further away from the windshield toward the front of the car, but there is no common reference starting point for that particular dimension. Without a reference measurement on the Ford Service drawing, there is no guarantee as to location.
(Sorry about all the drafting talk, it's my nature.)
Jim