Definitely an A-4F..! From "Reflections of Blue", I quote: " Modifications were required in her (the A-4F) inverted fuel, pilot restraint and elevator fuel systems, as well as a strenghthening of the outboard aileron hings fittings. Other changes included the addition of the VHF radio, a drogue chute, a built-in fold-ladder, and a smoke system".
The built-in ladder is located where the left gun was on normal A-4Fs, while the right gun is also removed and the opening faired over. The smoke system is a tube bringing oil into the exhaust, and it runs just under the 'cap' at the top of the engine exhaust. I've heard several people talking about wider, bigger air intakes for the engine, but my pictures do not correlate this...