1971 Seacraft 20' Question

[Gaffer]

What's a fair price to pay for a 1971 Seacraft 20 in fair condition with an older 90hp tohatsu on a trailer? Seller is unsure of engine year and based on research the engine is between 92-96. He is selling on behalf of a relative.

Hull is in original condition. Transom and deck appear to be solid. Wiring needs to be completely re-done. There are no working gauges (rpm or speedo). Hull is bottom painted. Not sure if tank was replaced. Console has a few coin sized holes in it from previous mountings etc. Basically boat appears to look its age.

Seller is asking $9k. From a pricing perspective, seeing that at a minimum it needs to be re-wired and will need to be repowered in the near future what would be a fair price for this boat?

Was not sure if I should have posted this in general or for sale.