440 Swap Steering and Front Suspension Rebuild

Hey there. I'm looking for help with my plans to rebuild the front end of my 70 Dart to accommodate dropping in a 440. After a lot of reading and searching the forum, I think I've confused myself...

73 BBP swap to disc brakes: I plan to do the typical swap to get the extra stopping power up front.

K Member / Mounts: Plan is to go QA1, which follows the 68-72 K so I got Schumacher conversion biscuit mounts. Will need a torque strap too I hear.

Steering Box: Going manual. I heard / read that so long as I stay manual, the sector shaft would match size between 68-72 and 73+ boxes. Looking for the smallest manual steering box available to help with header clearance. I've read that factory is already small / possibly as small as you get. Not sure if Flaming River's different shape would help or harm header clearance as opposed to the denting you hear about with most 440 swaps.

Headers: Haven't gotten too far here, but the motor my dad had built before he passed is quoted to run on 110 octane and have appx. 600 hp. I think TTI 1 7/8 or 2" headers are what I'll go with to keep it breathing.

Steering: I thought I understood that so long as the 73 BBP stuff remained uniform, that I could use the 68-72 manual box, center link, pitman, and idler arms. I saw what made me think so long as those 4 components (box, center link, pitman, idler) remained the same year, that I could use either. I'd just go 73+ everywhere, but I'm not sure if the steering components would fit right with the QA1's 68-72 K design.

Looking to make something along these lines work with factory parts, with the exception of the K, then replace components as I go / when I have more money down the road. I'm want to buy a PST Super Front End rebuild kit for the 73+ parts and keep the 68-72 box, center link, pitman, idler matching the QA1 K. That kit would include a 73+ idler arm as overlap with the other 3 of those components I plan to keep 68-72, but I'd just sell that here when it arrives. PST said they're pre-packaged so they can't swap out parts in the kit...

Extra credit... QA1 68-72 based K + 73 BBP LCA's = ??? Sway bar ???

Thanks for any / all input!