First, I'll throw this out there. Jbrown11_1 and Omisson, y'all get in your vehicles and drive to the border, swap keys, trade an apple pie for a jar of maple syrup, then hop in your new rides and drive home!
If that doesn't work, below is a list of items that was required to swap my 70 Duster from auto to 4 speed. Some of this may not apply to an RC, but you'll get the drift. And as for the effort needed to complete the swap... it's substantial. This isn't something you can tackle in a weekend. Even if you really, really plan it out and account for everything, there will be some things that come up that are out of your control. Not trying to talk you out of it, just want you to have a realistic understanding of what you'll be in for.
Here's the parts list...
Manual transmission (and possibly a rebuild kit)
Shifter body (and possibly a rebuild kit)
Shifter to trans adapter plate, plus bolts
Shifter handle
Shifter handle knob
Shifter handle rubber boot
Floor to shifter handle boot bezel ring
Shift linkage rods, and bushings/clips
Bell housing, complete with inspection cover
Bell housing ball stud
Clutch fork
Clutch fork return spring
Clutch fork boot
Clutch fork pivot inside bell housing
Clutch fork adjustment rod
Throw out bearing
Pressure plate
Clutch disc
Flywheel
Pilot bearing
Brake/Clutch pedal assembly
Clutch rod
Z bar
Z bar bushings
Frame ball stud
Frame ball stud support bracket
Firewall clutch rod boot
Clutch and brake pedal rubber covers
Clutch and brake pedal bezels (optional)
Reverse lamp switch
Reverse lamp wiring harness
Reverse gear indicator light (optional)
Speedometer cable and gear
Transmission tunnel hump
Manual transmission carpet
Driveshaft, or correct yoke
U joints
Floor shift steering column (if currently a column shift)
New starter (possibly)
All associated bolts, bushings, bearings, seals, gaskets, and retainers