4 Special Metal. Call would be nice, but you should only run 10-11 energies and you can't afford any more non-searchable ones and the special metal is more important. I can't believe a deck that runs 8/11 special energies will have any kind of consistency.
Honestly, from testing this deck extensively, all it needs is 3 Call. 4 Special Metal is very nice in here though. I suggest running a Conductive Quarry in here as well, if you max out on Special Metal. If you wanted, you could do 3 Special Metal/3 Basic Metal if you're scared of both of your Basic Metal being prized.
QFT. Call gives access to so much more consistency than a deck without them, and the Sp. Metals allow for walling low output decks like Gengar or Kingdra.