Factory service manual outlines steering gear removal procedure. I was able to remove my power gear after pulling pitman arm from under the car equipped with Clifford shorty headers.
You have to lower steering wheel, loosen the bolts holding it to the floor. Drive the split pin holding steering shaft coupler to steering gear, and gently pull steering shaft back from gear.
Under car, disconnect outer tie rod joint, disconnect pitman arm with pitman arm puller. Beating on pitman arm with pickle fork may damage steering gear’s internals. You may or may not have to disconnect exhaust from headers.
Back off the three bolts holding gear to K member, and then remove the bolts. The gear should slide out with a little frigging around, and cussing.