Tr-6 with champion aluminum heads?

[vboosted6]

Im having issues with my cam sync and getting a code 13 with my TR-6. I was told to use resistor type plugs.Looking to get recommendations to which ones to use.Im running 93 with alky.

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[ETraugott]

I run NGK UR6

 

[ETraugott]

I run NGK UR6

stick heads though