Lyman Slack was a Chevrolet dealer so are you saying your car was purchased there as a used unit?
They weren't just any Chevy dealer either as they delivered one of the '67 L88's!
There's an L/S plate frame on eBay right now at this link...BIN w/ a few watchers.
http://www.ebay.com/itm/Portland-Oregon-...e-/111218057230
Also, check this link from here a few years back for some L/S info also note there were some repop plate frames available then.
https://www.yenko.net/ubbthreads/ubbt...rs-portland-or
This link has some good L/S info too...
http://www.stumptownblogger.com/2010...chevrolet.html
L/S delivered '67 L88 Roadster @ 09/13 Mecum/Dallas Auction...
https://www.mecum.com/lot-detail.cfm...=DA0913-165417
Best of luck w/ your car and welcome aboard!
[img]<<GRAEMLIN_URL>>/beers.gif[/img]
~ Pete
