K frame relationship to steering box

Sorry guys I looked for the answer to this and keep coming up empty. I've read you can use either the 67-72 V8 K frame or the 73-76, provided you use the pitman, idler arm, and center link from the same option you choose. I'm going 340 and want to ditch my 67 /6 frame. I have a 73-76 V8 frame with the correct center link and sway bar, as well as Jim Lusk reinforced lower control arms.

My concern is does this mean I have to ditch my 67-72 steering box for a 73-76 because of the sector shaft difference and resulting pitman arm incompatibility? If so is there any workaround for it? I appreciate any input...