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Factory F-350 blocks (I have some if your interested), after market blocks, add a leaf or and overload (big thick flat spring) add a leaf to the bottom of the spring pack which acts like a block, usually good for 1/2 to 3/4 inch.
With all those options except usually just the standard add a leaf you need longer u-bolts as well. I have blocks, and u-bolts as well that the top overload spring and spacer block if you are interested.
Rezvani's Latest Post-Apocalyptic Monster Is a Ford F-150 Raptor Underneath
Slideshow: Called the Fortress, the 850-horsepower pickup combines Raptor underpinnings with military-inspired features, survival equipment, and a starting price of $285,000.