If you have a race head you should be able to notice larger/deeper heat sinks (fins) on your head compared to a stock one.
Stock heads are also stamped with a certain letter number combo. Just punch in the numbers on your head into your google machine and see what it gives ya.
But to answer your original question there may not be a 'race" cam for a stock head. Perhaps the valves are too small to be considered race. I have the 88 kit with the tagegawa S cam. It makes good power IMO