Seems Californians will pay a lot for old cars. The 3-4000 figure for a grey market 28 year old would be more likely, BUT it is kinda special. If it suits you none of those prices are high for a good piece of equiptment.
The clutch more likely has a hydraulic problem, if it was worn the pedal would be high.
Yes, it does have valves to adjust as do all V8's till the 1976 model year. All cars with CIS fuel have hydraulic lifters, those with D-Jet need to be adjusted.