Evidently a 1988. Guessing from the white cable guides that it was an SR1000, as the Sante components were painted white. The 1988 catalog shows the riveted on derailleur cable stop on the chainstay and this frame has the welded on stop, so that must have been a change made after the catalog...
Is the derailleur only an issue when in the small chainring? If so I would think you could shift to the middle ring before you get to the smaller cassette cogs.
The eBay listing shows it restored, but no good detail shots. He says new SunTour parts but I can't tell what model he used. 1987 SM400/500 would have had Alpha 3000 with a Sugino VP crank. Sorry but I can't help with the Bowling Green angle.
I was thinking more about the high and low gear ratios compared to a traditional 22/32/42 and 11-30 setup. Most of MTB rides involve some pavement riding, although I don't know how much time I spend in the 42/11 combination. Working from the low gear combination, 22/30 is roughly equal to 36/50.
The closest thing I have here is the one on my SR500. I believe it's 5 degrees and 115 mm. Will text my friend in STL and see if there's a shorter one there. I have a drop bar on the Silk Road but I couldn't get close enough to the bike to measure the bar diameter. It could be 25.4 or 26.0.