Triple was added 24 years ago, but the cranks are original Shimano 600 with built-in extractor (which is very handy). I suspect all the LBS had to do was add the small chainring. The small chainring is indeed a 74mm BCD. The only parts I'm missing are replacements for the original rubber hood covers. Shimano 600 brake levers mounts are very small compared to their modern equivalent. I'm going to hold up taping the handlebars until I find something that looks better than what I have on there.