For big block and short water pump. Get your steering corrected with Unisteer's 1958-64 Rack and Pinion kits for all of the tri-five Chevrolet models. The rack and pinion has been made with the correct ball center dimension, which eliminates any bump steering. These are bolt-on kits, which means you won't have to modify your chassis or make any unnecessary modifications. In addition to the rack and pinion included, the kits also includes the mounting brackets, new steering arms, outer tie rod ends, all fittings, mounting hardware and installation instructions. NOTE: these kits do not include the power steering pump or hoses. *NOTE: 16946 and 16947 also will fit the Bel Air models