Performance Head Gasket for '91 Rocky (Feroza, Sportrak) and importing a 2.8 diesel to the states


I'm looking to do some modding on my rocky, 1.6L petrol, but I can't find a place that sells any performance head gaskets, either in USA or anywhere else in the world. I know other people have gotten them, so if anybody could let me know where to find one I would very much appreciate it. I guess specifically I'm looking for a thicker gasket......Also if anybody has any info on importing the 2.8 diesel to the states, that would be interesting too. Thanks much in advance