Depends on the price.
If you can get it for market value less the price of an overhauled engine and prop and work up a list of what's wrong with it and what needs replacing plus a contingency fund of 20% and then make an offer.
I've bought and sold aircraft that have been sitting for 15 years , I made money on them sold as-is and the buyers were happy with the prices they paid so it gets back to what it's worth in it's current condition.
Don't expect the owner to get back to you straight away , they have highly inflated opinions on the value when they are selling. Make an offer and he'll probably get back to you a few months later after he's shopped around and nobody else is interested or offering less than you are.
I've waited 12 months to buy some aircraft , just be patient.