No Compression

Well put some ultra lube in all the cylinders and didn't make any difference in compression. Reading 0psi on all cylinders except #6 it was 32 psi. As I turned it over all valves and lifters look to be operating quite nice. How would I know if it was the head gasket there is a lot of crud on and around the head it self. I have some vacation time coming I think I might do the head gasket next. What do you guys think? Is it hard or even worth it?