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Does anyone know with caps?

Has anyone used these with the nylon spacers?

Like a small block do you need to use a hardened disi drive in a BB or some other part

I have a 451BB, 10.5CR, edelbrock heads, 550 lift hyd roller, firecore disi and revenator street driven. I don't know which spark plugs to use and what size gap to set Thx