When it comes to K5's the decent ones are not cheap and the cheap ones are just that...
This was my high school ride. It was a '73, first year of the body style. Still love the full top option. Go back to a '72 or older with the older round body style and expect to pay 4X or more, for something in decent shape.
http://www.***boat.com/forums/attach...1&d=1197262479
That was with 31's on it. Ended up doing add a leafs all the way around and running 33's on it when I sold it. Lots of fun though. 383 with a Turbo-350 and a shift kit that would bark the tires... gotta love high school.