I run have Motorcraft for as long as I can remember with no problems.
Maybe because I change my plugs every year, I know I don’t have too.
Tried Champs for a while because I heard they worked and lived longer but no-go, sucked !
I have turned low 12’s with 289CIs in an early Stang running Motorcraft plug with no failures, cleaned them between runs that is all.
Stick to a standard plug; the multi-electrode and those other funny plugs are as stated above “gimmicks".
IF you happen to change over to an Ignition Upgrade, the fancy plugs will feed back the wrong resistance readings to the Electronics Box and in turn screw you the wrong spark configuration.
Long Live Motorcraft...
4x4, 5sp, Std Cab, Stepside, E4 Red
4” Lift - Coil-Overs, 6” SkyJacker Leafs - No Blocks (Mistake)
31 Spline FX4 Rear Axle, 4.56s and OX Locker, Hurst Shifter w/Optional Stick and "Made by Grev" alignment adapter