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All 888's used a 351 head that was drilled with smaller diameter head bolt holes to fit the 302. These heads are specific to the 302 marine engine. As I recall the casting number is still normal 351, but even if you replace your heads with ones of the same casting numbers (from say...a car), you'll need adapter washers to mount them. These washers can be bought at racing part suppliers.
Since these 351 heads with the smaller head bolt holes were special heads for the 888 would they say 351 or 302? Pulled the heads off of my '77 Mercruiser 888 and they definitely say "302". So are these actual 302 heads or the special 351 heads?
If they are in fact 302 heads am I better off replacing them with 302 heads or 351 heads?