I was under the impression the best move in that position was 6... Nc6 keeping an eye on d4.
Salvio gambit: Santa Maria defense as a good but rarely played extremely sharp opening
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this is from Millican in 1989: 5 Ne5? (the Salvio Gambit) is refuted by 5...Qh4+ 6 Kf1 Nc6! when Black sacrifices material himself in order to throw virtually everything that remains at the White king, for example 7 Nxf7 Bc5 8 Qe1 g3! 9 Nxh8 Bf2 10 Qd1 Nf6 11 d4 d5 12 exd5 Bg4 13 Be2 Nxd4 14 Nc3 f3! 15 Bxf3 Bxf3 16 gxf3 Qh3 mate. As old as this is, I believe there was some more recent analysis on this line published on Chess Cafe a few years back. They concluded the same thing. I don't remember which one and that's all behind a paywall now.
(I know this is off topic; I think the Santa Maria Defense is good and interesting too.. really anything has to be better than putting a Knight on h6, but I thought you might be interested in this defense as well since you're looking at the Salvio.)
tmkroll wrote:
this is from Millican in 1989: 5 Ne5? (the Salvio Gambit) is refuted by 5...Qh4+ 6 Kf1 Nc6! when Black sacrifices material himself in order to throw virtually everything that remains at the White king, for example 7 Nxf7 Bc5 8 Qe1 g3! 9 Nxh8 Bf2 10 Qd1 Nf6 11 d4 d5 12 exd5 Bg4 13 Be2 Nxd4 14 Nc3 f3! 15 Bxf3 Bxf3 16 gxf3 Qh3 mate. As old as this is, I believe there was some more recent analysis on this line published on Chess Cafe a few years back. They concluded the same thing. I don't remember which one and that's all behind a paywall now.
Yeah, thanks, it's interesting. 
Stockfish 8 here seems to confirm this analysis. 
I've just discovered a historical game/composition Greco-NN (1620) featuring the Santa Maria defense:
http://www.chessgames.com/perl/chessgame?gid=1272507
The traditional line is 6...Nh6. However, 6...Nf6 is also good and extremely sharp double-edged opening!
