There is a solid 3/4 inch between the control arm and the header. That is without any alignment shims though. But if you need 3/4 inch of alignment shims then how about buying a new subframe!??!??
I have installed them in a speedtech subframe and a 55 belair frame. Both fit nicely. Here is the catch. I made m own motor plates that set the motor back an additional 3/4 from the ats plates, which gives more than enough room for the steering joint on the rack. if the motor sat 3/4 inches farther ahead, you would not be able to use only two u joints and 1 shaft to hook up the rack, you would need a hanger and a third u joint.
Other than that, they clear everything else with a bunch of room.
I have no experience with rear steer boxes, we have always been selling rack kits.
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