I salvaged the bike out of the recycle pile at the non-profit shop where I volunteer. I replaced every single moving part, again with salvaged parts from the bins at the shop. The stem is original.
I rebuilt it with a 3 x 8 drive with Sora brifters, just because we had them and don't use them often. I put decent 700C wheels on too (we get too many of those donated), and found dual pivot brake calipers with long enough reach.
Here's the best photo I could find. My short stem has a downward angle. Funny how I recognized yours just from the head tube (and the braze-on cable guides).
I looked up the MSRP of that bike. It was $999 in 1983. I got married that year and got a replacement for my Schwinn Continental as a wedding present, a decent Japanese touring bike for under $400. There's no way my 1983 self would buy that bike.