Head Gasket .60 overbore
So it took awhile but I found it. It's a Aussie company,Endurotec Gaskets.#GSAP210E
The bore size is 3.65625 and is .060 thick before torque crush.Don't know anything else about them,just puttin' it out there.Never used it but some of the guys over on slantsix.org have.