I did this swap last summer on my 91 w150. I don't know about an 85, but my floor boards work with the clutch. I swapped in a hydro clutch, so I didnt have to run any linkage. The hardest part I had putting in the clutch pedal was finding a pedal set. Once again, not sure how the 85's are, but in mine the brake pedal pivots on a metal rod, all I had to do was pull the rod out, slip the brake pedal off, and slide the new brake and clutch pedal on. Took me about 20 min, simply because its a pita to work under the dash. You will need a flywheel as you have a torque converter with the automatic, and obviously you'll need the clutch kit as well. I bought a set of manual driveshafts at a salvage yard, I swapped in a 4speed (NP435) which was shorter than my 4speed auto (A518), so I needed a longer rear and shorter front. I also ran into trouble because of my 6" lift, so the manual front was too short and I had to get a custom front made. Since yours is a 2WD you will only need the rear, and you may not even need it if the manual trans is close in length to your auto. I can't help with clutch cable/linkage as I did a hydro clutch (which was by far the hardest part of the whole swap). I bought my pedals, bellhousing, trans, shifter and rear driveshaft at a salvage yard. I got the trans, bellhousing and shifter for $150 with 80K miles. I love the 4speed, the only complaint would be the extremely low first gear. For daily driving I dont even use first, I drive it like a 3speed. On the flip side, the low first gear is a huge advantage if your ever stuck or if your off-roading. Overall, the swap was a lot of work (I also did a motor swap at the same time) but it wasn't extremely challenging.
More corn....Less pavement