I gotta say, it is hard to fly without modern HUD. I've been playing flight sims for over 20 years now, starting from early days Amiga games to PC's Flight Simulator series to Falcon, Il-2 ww2 simulators and while those planes didn't have HUDs, flying the F-14 in FCS is the hardest thing to fully master. Reading speed gauge is hard work, just as altitude. AoA is just under control. Somehow flying with HUD just makes things so much easier and comfortable.
I absolutely would not mind to have an F-14D module which would be the definitive version of this work of art.