Rocky mountain parabolics give you a 1" over standard lift. And standard ride hight would have been at least 20 odd years ago before your leafs sagged so you would in effect be looking at a 1"+ lift over current ride hight. The sort of lift thats not going to upset your props too much.
Bad news about yer missus but every cloud has a silver lining. At least you'll have more time for fettling wiv the landy.