Looks good. obviously very Stall-Based. But I have a few options to consider if you so desire.
Hippowdo.: Roar is a good phazing move, but Soundproof can protect against it. Whirlwind is always effective. Alternatively you could replace Roar with Yawn to force a switch and should the choose to stay in, they fall asleep and you now get free setup turns or what have you. Yawn + Toxic Spikes/Stealth Rock van be EXTREMELY annoying especially since Yawn is highly spammable if your prediction skills are good.
Heatran could run a Life Orb set since it won't see any action til any real threats are already picked off late game anyway. Other than that, looks good.
Salamence with Intimidate works better in a more defensive way, which pretty much wastes Sally's potential value. Go with:
Salamence @ Choice Scarf
Adamant Nature (+Atk, -SAtk)
EVs: 252 Atk/ 252 Spd/ 4 HP
- Zen Headbutt
basically KO anything with Scarf's Spd boost. Moxie will up its attack. KO next Poke. wash, rinse, repeat. easy sweep especially mid- to late-game.
hope that helps.