uh. Well. Quote honestly you should probably ask them, or have gotten our wires...
Additionally, yes, we find that the Motorcraft copper cores offer excellent performance and low cost, and with the ease of replacement on a Zetec, the copper's somewhat shorted life span is not a huge issue. I would run .055" on a bolt on car.
You CAN'T really gap Iridiums. You'll break the tip off with traditional methods. You can use a pair of needle nose and grab the strap, but it's difficult to be consistent with that method.