I'm sorry but I think you jumped the gun on the Chevy II/Nova. The 1968 models were all "Chevy II Nova". It was discussed here:
http://forum.imcdb.org/forum_topic-6684-44799-196869_Chevrolet_Chevy_IINova.html#p44799

Not sure about the other years, but should put over in "Naming Conventions" to get a consensus.