Well, here is my take on it:
Landorus-T uses HP Ice to Kill other Landorus, so you generally don't need any SpA EVs to do that. Never-Melt Ice isn't a great item when Leftovers, Rocky Helmet, Choice Scarf, and Life Orb exist. :P
Technically, HP Fire would be better for a Split Lando, they only use HP Ice for other Landorus while using a Choice Scarf set. Here are some calcs:
108 SpA Life Orb Landorus Hidden Power Fire vs. 248 HP / 8 SpD Scizor-Mega: 281-333 (81.9 - 97%) -- guaranteed 2HKO
108 SpA Landorus Hidden Power Fire vs. 248 HP / 8 SpD Scizor-Mega: 216-256 (62.9 - 74.6%) -- guaranteed 2HKO
108 SpA Landorus Hidden Power Fire vs. 4 HP / 0 SpD Kartana: 516-608 (198.4 - 233.8%) -- guaranteed OHKO
108 SpA Landorus Hidden Power Fire vs. 252 HP / 164+ SpD Ferrothorn: 152-180 (43.1 - 51.1%) -- guaranteed 3HKO after Leftovers recovery
108 SpA Life Orb Landorus Hidden Power Fire vs. 252 HP / 164+ SpD Ferrothorn: 198-234 (56.2 - 66.4%) -- guaranteed 2HKO after Leftovers recovery
Source
Use Life Orb or Leftovers instead of Never Melt Ice. Leftovers if you want to help it take hits, and Life Orb if you want to kill things faster. This also works as a Lure because Pokemon like Kartana, Mega Scizor, and Ferrothorn are often sent out against Landorus-T. :P
Hop I Helped!
