headgasket and bore size

The engine i bought off sezam on here has a 85mm bore rather than a standard 84mm (M50)
my question is can i run the normal headgasket bore of 84mm or will i have to get a custom one with 85mm ?

thanks in advance
steve

standard gasket should be ok.but also you can use S50 3.0 from US its bore is 86,it would do too.

thanks narusa