Thanks for jumping in Gentleman,....Rendegade, it is quite possible I have the name completely wrong!
Your last couple of F3A A/C with an Anhedral, would you be so kind as to post a few photos?

Michael,

MajorTomski,

I believe you are correct, they probably were influenced by the F-4 Phantom. Funny you should mention,..I Flew the OH "Double Ugly"
in the USAF for 13 Years. Fabulous 60K pound machine.

RF-4C.... Reconnaissance. The Stab was 23 Degrees,....and it was not Differential. Subsequent US Fighters,...F-14,
F-15, f-16, T-38, F-5, F-20, F-111, and others, all had "Full Flying Stabilators, however they are Differential.

Michael,