First off, did you retract the tensioner all the way? My stock chain felt a little tight after installing cam too, but when I installed tensioner it went in fine. Make sure you retract tensioner and hold it in place with the screw driver then once the 2 bolts are secured you can remove screw driver and tensioner will do extend out and apply necessary tension.
I have never seen those plugs in my stock engine. sorry.
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