King Shocks and Custom Leaf Spring Height

I'm looking at getting some King shocks front and rear for my truck along with some custom Alcan leaf springs. Wondering what would be the proper amount of additional lift in the rear with the new springs so my truck sits level. They can custom make the springs with whatever amount of rear lift is desired. My truck sits about 1" low in the front with the stock suspension. The King front coilover shocks out of the box will raise the front about 2 1/4". So now my truck will be 1 1/4" high in the front. If the custom leaf springs are made with an additional 1 1/4" of lift in the rear I'm thinking my truck would now sit level. I realize the front coilovers are adjustable, but they recommend not cranking them up past 2 1/2".

I've done a lot of reading about suspension upgrades, but still unsure about the whole front to back lift height to get the truck level.