I would think you will be ok. When GP Headers was asking me about my order, they asked if I would be using the narrow, or wide bolt spacing. I will be using the wide, as that is the spacing on the Felpro gasket that Prestige recommended...and my heads are drilled for 3" spacing.Waiting for some Raptor coating supplies, so was test fitting my exhaust, RCR snakes to 302/347, noted the same issue others have had, i.e., the head flange prevents spark plug removal. So I confirmed I can use the inner of the two mounting holes, this would allow me to machine off the mounting ear on the flange which prevents spark plug removal. I don't want to remove exhaust to change plugs. What does the collective think?