It has been done (with varying degrees of success), but it isn't all that common for a couple reasons:
-Be prepared to either spend a ton of money, or build everything yourself. nothing is cheap in the land of 350 conversions.
-Be prepared to kiss most if not all of your current drivetrain goodbye. It wasn't designed to handle a 350's torque.
-Be prepared to fight cooling issues. XJs and MJs go into v8 conversions with one hand tied behind their back because our smaller grill opening doesn't really lend itself to keeping a v8 cool.
I don't mean to discourage you, just want to give you an idea of what you're up against. :thumbsup: