Insurance replacement value...what's your guess?

[ETsC10]

A friend of mine got his truck pasted HARD in the rear
and I'm trying to help him determine what a fair payoff
from the insurance company should be.
The truck is in Seattle, WA.

Here are the only specs I've got so far...

1979 K10, SWB, black on black, 350/350, 373/open, PS, PB,
converted to Part-time 4WD, factory sliding rear window,
rust-free body, 4" lift, 35" tires on alloys, no tow package.
Truck frame and body were straight before the wreck.
What's your guess on fair insurance value?

...If I should be getting more info,let me know.
(yes, as soon as I can, I'll get pics)

...I only know the older trucks so help me out here fellas...
Thanks...ET

........and before you ask...he will be buying it back,
will not be parting but will be repairing the frame & body.