Autolite 3924s Arcing to the Head!

[SpeedDensityET]

I just got my car running last week with the combo listed below. It was running great until i installed an MSD 6A box a few days ago and the car started to not feel as strong. I fired the car up at night and the plugs seemed to be arcing to the head. At first I suspected the plug wires, but i tried a brand new wire off of my dad's car (with the same ignition box) and the plug still arcced. Upon further inspection, it appeared as though the spark wasn't coming from the boot but from the hex-shaped part of the plug shooting to the head. I even unhooked the box and it did the same thing with the stock ignition. The plugs are gapped at .052 and all 8 plugs are arcing. Anyone had similar problems with these plugs or have any ideas? Thanks.
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Now mass air converted! So what if my name is outdated?

87 GT: AFR 165s, E303 cam, Scorpion 1.72 rockers, 3.73 gears, GT-40 upper and (ported) lower, 70mm BBK TB and EGR spacer, BBK 1 5/8" equal length headers, Off-Road H-pipe.

 

[Stang8URMPRT]

I had one arc on me, but it was because I broke the porcelain. It was very visible and the car had a bad miss. Just a thought.