Mega Damage in Savage Worlds is just heavy-weapons. You still get all your normal armor and toughness from your cyberware. Also because the gargoyle is a demon you get +2 toughness vs it's attacks (so your toughness is an 18 right now). That is still 3 wounds but also remember that your Toughness is a d8 right now from Alenys boost trait.
BUT spending a Benny to re-roll Agility might be the best as a 5 means you avoid all damage. but if that fails re-roll the soak with a d8