bottom, the sway bar was on the car when I bought it so I left it, original to the car? I don't know, no build sheet.

original grabber

I took these pics just for fun before I tore the 4 gear back out for a bad input bearing (Thanks Brewers for the new bearings)she'll be together soon.
This was built to drive, not to show so it's alittle dirty in the pics

Looks like a nicely optioned car with lots of potential! By 71, a lot of runners were equipped with many of options, unlike the earlier years.
All 71 383 road runners were N code cars. It designated an HP 383 4bbl.
The canopy vinyl top was available the entire model year on road runners, made available mid year for GTX and others. Nothing especially rare about that on a runner. Also, the canopy vinyl and strobe stripe combination isn't especially rare.
What is not as common is the A/C and 4spd combo. Also odd is the combination of A/C, power steering, and manual drum brakes.
In addition to what was already mentioned, the A87 road runner decor package included hood indent pinstripes (V21), the 3 spoke delux steering wheel (your car has), the upper door panels you have, the strobe stripe, AND brite wheel opening mouldings. You'll most likely find the holes still there from where they were attached.
As mentioned previously, you'll want to visit the website in my signature. There are lots of 71 B Body guys hanging out there (it's dedicated to 71-74 Plymouth B bodies).

I know these are some of the best looking mopars. The 71' roadrunner has always been my dream mopar to own, but I never thought I would stumble across one with so many diverse options. I'm going to paint it back to the origional curious yellow. The only thing i don't like about that color is that it has a lot more green to it than yellow.
I will definately keep searching for another build sheet. I might also contact the chrysler historical society and see what they can dig up as well.