we can chart what was stock. but once you start lifting it, it's hard to know for sure what you need without measuring it yourself.
rule of thumb is that an MJ can get away with a stock driveshaft going up to 6" of lift. no guarantees. it won't be ideal mind you, but it's been done with success.
and you should always change your ujoints when lifting. ujoints don't like it when you change their operating angle.