A new, larger UHT was required as a result. When the U.S. Navy upgraded some of its F-8Es to the F-8J configuration, this wing and horizontal tail was used to accommodate the increase in gross weight.
Thanks to Tom (Superheat) Weinel and Vought data, I'm finally able to create a pretty good illustration showing not only a size comparison of the larger horizontal tail but where it was located on the fuselage relative to the original one.
Although the UHT was mounted with dihedral of 5° 25', I was unable to determine if the spans given were actual (tip to tip when attached), or of the UHT without dihedral. My guess is that the span was with no dihedral, which is how I created the illustration above. In any event, the difference in span is only about 1/2 inch.
For a summary of F8U/F-8 differences, see http://tailspintopics.blogspot.com/2009/10/f8u-crusader-variations.html