BOAC
Off course you need the correct GMC for your specific RWY of DEP, to satisfy the ENGINE OUT climb requirement. You can NOT calculate that yourself !
My input were for the ALL ENGINE SID climb requirement, which is the responsibility of the pilot to comply with.
Even though many pilots are not aware of that, and do not know how to make that simple calculation, which is very easy and fast to make (even for an old man like me ;-)