Hey guys I have a 1999 v6 and I'm lookin to change the spark plugs wires and coul pack but I don't know which are the best for this car I've heard many things like ngk are bad for a mustang and to stay with a copper core but I have never done spark plugs before so all your help would be great thanks guys.
NGK is contracted by Ford to make most of the Motorcraft spark plug line...
OEM is platinum. Stay with platinum for a stock car. Copper is used in most performance engines because the copper will tend to melt and errode before the piston does in the case of a catastrophic failure. There are other reasons copper is used, but none of them concern a stock V6.
Copper will last 20-30,000 miles, while platinum will last 60-80,000.
As for the coil pack, I would not change it unless it was defective. If I had to change it, I would only swap in a direct replacement, meaning an OEM Motorcraft coil pack. Do not fall for the tricky language of aftermarket coil packs and the cheap price of generic brands. You don't need more voltage than the stock part provides.
RockAuto sells the Motorcraft coil packs for my 97 V6s for about $95 each. I believe they are the same part number as yours. That's the cheapest I've found them by about $80.