Why is Infernape running max Speed? I'd just give it enough to reach 332, 196 Spe I believe, outspeeding Mixape and 176 Speed Latias. Putting that little bit into HP or SpD can go a long way. In HP, it guarantees you survive a LO Shadow Ball from Gengar after Stealth Rock, as well as a small chance to survive a Naive ScarfTran's Earth Power after Stealth Rock.
Since you are not going to be surviving many Earthquakes or Close Combats, you could just put the 60 remaining EVs into SpD to further your chance of surviving said attacks. You don't have Life Orb like other Apes, which is why this can actually work. Situational it is, but not quite as situational as needing to tie with an opposing Infernape or outspeed a max speed Mismagius.