Bill, I rode one exactly like that - same color, year, and condition in May of this year at Deal's Gap. It belonged to a friend of mine, Frank Tarpley. The bike had tons of torque low and middle, but no hit up-top like the Kaws. It was a bit on the shaky side - vibrations were felt at cruise and above. I'd put it into the Yamaha XS650 shake/vib category. They are awesome machines and I'd love to have one. Infact, that is exactly why I rode it - because I had wanted one.
On the same ride, Allen took his 1974 GT750 buffalo. I rode the Cobra to the Fontana dam and then we switched on the ride back - my first ride on the sweet 2 stroke, 3 cylinder, water-cooled 1974 Suzuki 750. I fell in love with that bike in less than 20 miles.
That was end of May -
By the end of July after watching eBay daily for 2 months - I found one in just the condition I like them - "dead and ready for burial" -
Did you know that the GT750 is actually a 500 twin with an added cylinder? Seriously. Many of the top-end parts are from the GT500.
Gordon