What plugs are you using RB Indy EZ heads hyd roller

Depends on compression ratio. I use NGK street plugs for street cars, race plugs for race cars.

11 to 1 have ngk r5671a-8 street driven breaking it in they look cold to me

Look at the Autolite 3923 for your motor, try them first and if they seem to cold try the next hotter step 3924. I like and use Champions also, thier RC9YC would work well in your motor also
NGK brand work well also and may be available at your local part stores

Race plugs aren’t great on the street.

Try an NGK BCP7ES

I am running the NGK R5671A-7 in my street/strip car. That's the plug Indy recommended I run with my 10.6 comp and EZ heads. Ron