Looks like a 1970's.
Heard owner of K&C died in a car accident thus reason why the company stopped producing boats.
Is that boat between 13 to 16 ft long?
90 hp seems to be too high power for that sized boat.
When you walk in the boat does the floor feel solid?
If it feels spongy then it may be rotting out.
Also how is the transom?
Grab the back area with two hands & give a strong push & pull.
Feel solid ?
Any cracks in that area ? See any rotting signs around stern area?
Definitely not going to be a perfect boat at that age but you do not need to buy & have to spend 1000's to repair.
Hope the boat turns out to be a good deal for you.
We bought a similar sized boat ( 13fter ) with a 35 hp.
Traveled thru Canoe Pass to the Straight; from Steveston to New Westminster, Sandheads, North Fraser to Straight on & on...had tons of fun & adventures & many times our hearts were in our throats. Really fun boat but high tide / low wind days if your in the river or salt.