I don't think I'd invest a lot of time and money into it, or at least not a lot of money - I wouldn't say its rare (well its not as common as say a Targa, but hey) or a collectors piece by any means. I'd like to see some photos of i though, I kinda have a soft spot for CCMs even though they were terrible from a road cyclist point of few. I think the silver ghost had 531 main tubes with plain gauge stays and fork? Are the drop outs stamped or forged?
The Silver Ghost used Reynolds 531, plain gauge, main tubes with high tensile forks and stays. All the ones I'ver seen (and owned) have had stamped dropouts. It was 2nd in the line and originally designed as a club racer, being spec'd with tubular tires for 1973-1975. In 1976 it was downgraded to clinchers but was otherwise unchanged. There was a major makeover in the livery for its final year, 1977, when it became CCM's top model.
It's not valuable but is fairly rare, particularly if it is a tubular tired model. Very few of these survive, with the original wheelsets. Most got changed out by frustrated owners.