Anyone got some good info for relative C&V newbies on period Groupsets. It's not so bad when starting with a complete bike to change one item to match the period but when starting with a scratch frame then it's a little more difficult, so anyone who could share a bit of knowledge would be greatly appreciated or maybe there are resources available that you can point me towards for this info.

So, this is the thing - I'm mostly used to Modern Shimano so would have to consider that my cyfer when trying to understand comparisons, so if you could put it in that context it would be great. I have one Campag set, so not a complete Philistine, it's just for shorthand the Shimano, Dura Ace, Ultegra, 105 comparison works best for me when talking about relative period performance levels.

I'd like some info on the equivalent options for these 3 tier levels for between the 50s and 80s. I don't have a specific build in mind at the moment but it's nice to know what to look out for so if I pull a groupset together over time for a particular era / style then I can keep an eye out for a suitable frame and vice versa.

Thanks in advance and no glass hammers please.