Marvel.com says: "5'10" (in human form) 6'7" (as She-Hulk)" that's not possible. Of the 6'5+ women in the world, none of them are actresses. My preference would be a 5'8 she hulk being sold as ~6' and drop the comics height, just as is done on all male characters, but many fans make fewer compromises on what they want from female physiques since that is more important in their appeal to most fans than their character traits.
Also a 'tall model that can act' doesn't make for a very good film. If you want a quality movie, you need a talented actress, not just a passable one, and I'm pretty sure you're not going to find any at over six feet. Correct me if I'm wrong.
If you're looking for an actress over six feet tall. Here are all of your choices:
If you find one younger than 40, let me know.