Leaf spring arch

Im running short on money so before I get a lift which is gonna be awhile I think I'm just gonna get new leafs and put a budget boost on for shits and giggles. I wanna add a 2 inch shackle and 2 inch coil spacer but what leaf arch do I want to bring it to stock height then when I add the shackle it will set even

The standard XJ leaf spring only has 4" of arch in the first place. To answer your question, If you are looking for factory height, it is 17" from the bottom of the flare to the center of the hub on the axle. You can probably add a stock leaf to get back to that.