Please bear in mind I consider Garchomp and Blaziken banned for this rate. I would also imagine Soul Dew and
[email protected] banned, same as when Latias was allowed in DPP OU.
A well played Gengar could potentially wreck this team, especially if it is using a Life Orb, since it cleanly 2HKO's Gliscor, Conkeldurr with Shadow ball and OHKO's Ferrothorn with Focus Blast (without taking into account SpD drops), while dishing out massive damage to your sweepers. Landorus CAN KO with Stone Edge but I personally don't like relying on an 80% chance to deal with a threat - not to mention they can always switch out. Disable versions can deal with Landorus' Stone Edge if on a sub and Conkeldurr's Payback (though admittedly, you can Mach Punch and mess with the Disable).
To remedy this, I would like to suggest putting a defensive Metagross in place of Gliscor. You already have a Landorus so overlapping the types would add unneccessary weaknesses and Metagross is fairly bulky physically. Metagross also has access to Stealth Rock, which will make sweeping easier for Infernape and co.
[email protected]/Occa Berry/Iron Ball
Adamant
252 HP 68 Atk 188 SpD
Meteor Mash
Bullet Punch/Earthquake
Stealth Rock
Hammer Arm/Trick
With the EV's Gengar will never 2HKO with Life Orb and 3HKO with Leftovers while Metagross cleanly 2HKO's with Bullet Punch and Meteor Mash. Metagross can also deal with Terrakion with STAB Bullet Punch and can pick off weakened foes whereas before you would have to rack up damage from Infernape or Conkeldurr to pick pokemon off, or be choice locked with Landorus.
You can use the good old Lefties for a bit of healing, Occa Berry and Hammer Arm to nail Heatran either on the switch or as a lure, or even Iron Ball and Trick to get Levitating Pokemon. Since the most common switch in to Metagross are Skarmory and Rotom-A, you can Trick them a Iron Ball and make them susceptible to Earthquake, making them easy pickings for Landorus. The Trick strategy could also be used for Gengar, who may attempt to Disable Bullet Punch, only to lose it's precious Leftovers.
A final note, since you're using Trick Room Reuniclus, make Conkeldurr Brave and have 0 Speed IV's. This ensures you go first while TR is up and guarantees Payback will hit last when it isn't. You have priority in Mach Punch so there is no need to fear premature sweep ends.
I hope my rate has been of some help to you. :)