Just because the arms themselves are longer does not mean it will sit lower. If the lower shock mounts are the same distance out it will sit at the same height as before with the same shocks, unless under load, where as DDQ stated already, the added leverage will compress the shocks further.
Aftermarket arms are NOT intended to be used with stock shocks, of course it "works," but horribly so. Don't be cheap and save up for properly set up shocks for the a arms is the moral of the story.