I looked closely at one about 18 months ago in very good shape: electric
winches, good interior, decent engine, good shape cosmetically. I think it was around $50k. $73k seems like a lot for a 1976 boat, unless a restoration had been done that is really amazing.
The other thing is that the boats were designed by C&C but built by Newport, and that might lead one to think about build quality issues at the hull-deck joint, the lay-up of the hull, chain plates, etc.
One last thing, the 6' 3" draft might give some pause. It is a pretty boat, however, and there were some good articles about them online.
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Jim H
London, UK
Aurora, a mighty Cal 20 (Portland, OR)
Southern Rival, a seasoned Rival 34 (Gosport, UK)