I think there needs to be a world of boas.... I think perfect predators has a list but I cant be certain. Have you tried their site? I would even go as far as emailing them and asking if there was one!
EDIT: If you click on the boa constrictor link a sub category list comes up which looks to me like a morph list. If you do some looking around I guess you could compile your own list from the sub categories. Thats if you feel like putting in some time...
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