I have a 1977 CB-750 K. I've had it for about 4 years now. Try to get the price down a bit if you can. I've made numerous upgrades. Dyna ignition, Dyna coils, Dyna wires, Electek regulator-rectifier, modern fuses, Pogressive suspension, 530 chain and spockets. When I park the bike I get a lot of nice comments. Get the bike. Upgrade it and ride it. It's like land, they don't make any more of it. I like the 750 because where I live you just don't see very many 750's so it's kind of unique. Get a piece of history. Go for it and have fun.
Greg in Chicago.