I just showed that 76 Speed EVs would outspeed Modest Heatran...
Edit: Alright, but then you don't have anything to worry about, If it is stuck on Choice Scarf, you can just predict its attack and switch to an appropiate counter whether it be Blissey, Tentacruel, Rotom-H, Salamence, Gyarados, etc. What Tentacruel has to worry about usually is a SubTran who outspeeds it, because SubTran requires no prediction if used properly. To break the sub, Tentacruel would end up taking two Earth Powers and from Modest, IIRC it would 2HKO (I will have to check that). However, if I am 76 Speed, I can outspeed Modest SubTran and Surf twice, or Surf and Rapid Spin, or whatever.