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Spark plug problem


cny first gen 71

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Anyone good at reading spark plugs. I'm having a problem with #1 fouling out, used to take about 1500 to 2000 miles but its getting worse. This plug came out in Carlisle after less than 1000 miles. Had another one do it again after about 500. Picture isn't great but any help is appreciated. 

20200923_124218.jpg

20200923_124115.jpg

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Yea possible guide or valve seal. I have a new set of aluminum heads for it but was kinda waiting to do complete motor at once. Been collecting parts for as couple years now, still dont have them all. Wanted to do engine and trans while it's out. Decisions decisions. Summer is almost over I'll have to see. Thanks!

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