Shimano 105 early- to mid-1990s SLR groupset on eBay worth it for 70s SuperCycle rebuild?
For not much more than that ($600 dollars), you could put a new Tiagra 10 speed group on the bike. So in my opinion, no, that is not a good price for those components. 

Even if they were unused, it would be a high price. You are the only one who can make that value judgement, though. 

Do you want the vintage look and feel? Are the components unused? Do you think it's worth close to the same money as a newer, better quality group set?

Then it may be.