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Geat detective work Helmut!.
If it's any help and you haven't seen it yet here's a link to documents and POP of an LS6 'Camino sold new at Grove..
Note the Zone is listed as # 81 and Dealer # 079..
http://ls6registry.com/bal/more/1368...800b1466xx.htm
If you haven't been to it Penticton has a large car show every year that may be a great place to check for leads on what you're seeking too!.
Got your email...very cool you hooked up w/ Tom Harris even though he had no info from the old dealership days!.
Keep digging!.

~ Pete
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Thanks Andy, I sure appreciate your help and direction! I also saw that LS6 El Camino buildsheet when I googled Grove Motors last night, but I didn't catch the matching zone and dealer number you pointed out. I guess that clinches it.
I have a further update... after learning that my car may have been sold at Grove Motors in Penticton, BC, I put an ad in the local kijiji with a pic of the car looking for historical info about the car and the dealership. Wouldn't you know it, my ad flushed out the brother-in-law of the original owner. He confirmed that the car originally looked exactly the way I restored it except it had body color wheels and dog dish caps (which I figured). Those dog dish caps will go back on the car this weekend, if not tonight!