They come up on ebay from time to time.
Unless you're building a show car, using the vacuum advance system from 1968 isn't the most efficient way to tune the car. If you understand how it works, it can be modified to look stock but work much better to provide the advance curve your engine needs. But once you install it, block the retard function and adjust the advance to cope with todays fuel.
A complete description of how this works is in the 68 Diagnostic manual
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Ed
1968 GTO (Thanks Mom)
2006 Silverado
2007 Cadillac SRX
2015 Chevy Express 
2024 Cadillac LYRIQ
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