Denso Iridium TT 4701 IK16TT Spark Plugs Early Bronco Intermittent Misfire 351W

I developed an intermittent misfire and my 1966 351W bronco. I decided to check my spark plugs but cracked two while pulling them out. Now that I was in the market for spark plugs I settled on these Denso Iridium TT plugs. The problem with platinum plugs is the ground strap getting eaten away. This is usually the same problem with iridium plugs. Hopefully having iridium on the ground strap will alleviate the problem.

Spark Plugs in this video.
https://www.amazon.com/gp/product/B00TPU8OT0/ref=as_li_tl?ie=UTF8&tag=fintechcomm0f-20&camp=1789&creative=9325&linkCode=as2&creativeASIN=B00TPU8OT0&linkId=e30212cf762e6a0dc847a176e91caf29