Deuce,
I have a '67 coupe daily driver that had to have the trunk lid replaced with a reproduction. The trunk lid fit very good, but did not have holes for the lettering.
I opted not to go the route of drilling holes (TOO MUCH CAN HAPPEN!!!). So, I went with the stick-on letters (Remember, all new cars for the past few decades have used stick-on lettering). I'm a machinist by trade so I know how to read calipers in .001".
What I done was used a pair of 12" calipers,(graduated in .001"). It's was close because it's approximately 11 3/4" from the side of the trunk lid over to the letter "M". I used the 12" calipers then used 6" calipers when measuring from letter-to-letter. A friend of mine had an original trunk lid so I measured from the left side of the trunk lid over to the left side of the first letter "M". Then, from there I measured from the "M" to the "U", then "U" to the "S", then so on. I wrote down all those measurements from the dial calipers (you can use digital calipers as well).
Then, I measured from the bottom of the trunk lid up to each individual letter and wrote down all those dimensions.
Remember, I was measuring from the left side of the trunk lid over to the left side of the first letter "M", then from letter-to-letter.
It turned out really well.
You can do the FORD lettering this way on a hood as well. I have took a few pics to show you how well the lettering turned out. It was dark when I took the pics, so I'm going to take some more tomorrow with the garage door open in natural light.
Hope this helps.