I would use either 071's or AGPR12PP8, from Matt lewis 01922 692424.
Just make sure to use some sealant UNDER the front cam caps, or it WILL leak from here.
Best to do new seals on cams as well, but use VITON as they are better, but about £9 each, put a bit of sealant around the ends of the half moon seals, and TRIM the gasket as needed to fit in cam cap slots FIRST as they can need a tiny bit taken off to fit in snugly.
tabetha