Alright thanks a lot. How about the safety of these bikes? Obviously over the course of almost 50 years there have been huge safety improvements, so just how dangerous is a 70s bike in comparison to a new one, and what should I watch out for?
In my dailying two early 80s bikes I noticed two big differences between them and the comparatively modern bikes that replaced them:
1. They aren't as nimble as a modern equivalent. - Some of these bikes earned nicknames like "Widowmaker", "Evil", and "Wicked" because they sometimes were fitted with engines that could easily outrun the rest of the bike's capabilities. Having modern tyres does help a lot with making the rest of the bike's tech catch up to the engine, but don't expect a 70s or 80s bike to outhandle something new. Some of these bikes can also get a bit top heavy and that alone can change how they feel compared to a modern bike.
2. The powerful ones are less forgiving to mistakes. - A consequence of that first bit, if you screw up it may be harder to recover from it than if you were riding something modern.
With that said, if you're a responsible rider you'll be fine and have tons of fun. Both my '80 GL1100 and my '82 GS850G turn heads and appear to be awesomely reliable. The GL1100 was in storage for a whole year before I bought it. The owner's dad didn't even bother with fresh fuel. It started up without issues with no more than a carb cleaning. I've since cleaned out all the old fuel and it's running even better.
I'm currently looking at getting a Yamaha RD200 or some other 2 stroke road bike for a winter project.