Proper plugs for upper pulley

[EddieCuse]

Hello.
I’m doing the metco idlers swap, 3” alternator pulley and 2.90 upper

Wanted to triple check the correct plugs, especially as I have the weaker heads

I bought NGK TR65IX.
Stock number 3692

Thanks

 

[P49Y-CY]

both my cars are upper pulley only daily drivers and i have had good luck and many miles on the tr6ix #3689 gapped at .035. i check them for tightness at every oil change