PS: If everybody listened to people like you jbailey, we'd all still be living in caves
Great! NOW you're going to get the Geico Caveman coming after us?!!!
I think I hear my mommy calling...I 'll put her on speaker phone.
To answer the topic of the post, take the CB, it will be more comfortable. I am only 28, and even so, I would much rather ride sitting upright instead of hunched forward over my tank. If you know the mechanical limitations of the bike (following distance required for proper braking safety, and the tune-up/service schedule) just go for it! There are many of us along the way, and like SeaWeb says, if you run into trouble you will meet a lot of people willing to help you get back on your way safely.
Just read the story on adventure rider dot com's website about Mikki from Japan, a Japanese woman who has crossed the globe and met untold number of people willing to help her achieve her goal.
From your photos, your CB looks in great shape and I bet you, like most of us, you have returned the bike to manufacturer's specs, and then maintained the bike mechanically. There is no reason that if it could do it 30- 40 years ago, the bike can't do it now.
Just search out the "most miles on a CB" thread that testifies that these bikes can turn over the odometer WITHOUT having to rebuild the engine. Properly maintained, this bike will take on anything you throw at it.
Despite modern displacement numbers, the 750 is a HUGE bike. It was the biggest, baddest thing on the road when it hit the scene in 1969. Hell, 38 years after the fact, people (us) are still singing its praises.
Take the CB, have an amazing adventure, and keep us updated whenever you can. Gravel roads or not it will be the adventure of a lifetime. I wish you a safe journey and look forward to your progress reports.