headgasket

Hey, guys and gals. Had an accident in my jzz30 1jzgte swapped 84 BMW. Basically, the BMW is complete soarer front cut including ECU and electrics. I hit a possum that ripped off my radiator hose, emptied my car of coolant in seconds and the car came to a complete stop about 10mins later...

So I'm going to be rebuilding my RB20, and I can't seem to find any head gaskets, other than Cometic, or OEM. I'm boring the cylinders a little, as the cylinder walls are scoured, so OEM isn't really an option. I have heard varying opinions about Cometic, and I've been trying to see what my...