Ken Addington was involved heavily in the industry a that time. He may know about the boat.
I was the Shadow rep for TX & LA for two years in the mid 80's. Their factory was in Corbin KY. They were good looking boats with sleek lines and low profiles. I would put them one notch above a Tide Craft. I ran one of their 17.5' vee bottom boats for two years with a Yam 150. It performed well for a boat that size with a 150. Back then an 18' boat was a large boat. They also built a 19.5' Tunnel Vee that was supposed to be their high-perf bass hull. Shadow had a small following around KY. They went under shortly thereafter. This was a classic example of a bean-counter running a company. He knew nothing about bass fishing at all.
BassCat's biggest boat was a 19' 3" Pantera and I had three of them, '89, '90 & '91 when I was guiding full time. I told Ron Pierce & Ivan Williams it was time that someone built a 20+ foot boat and they told me that a 20 foot boat was too big and would never sell.
What did I know!? I only fished 250 days a year. LOL
The most popular boats back then were 17' 10" Rangers and 17' 9" Skeeter Starfire 175. I saw the first 20' Ranger at Star Mart in about 1991 or 1992.