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The actual work on the heads will run about 900 dollars from a shop. That is assuming you don't need new valves. I did a valve job myself on a Carrera and spent 3000 dollars when all was said and done. This included some other fixes and tools. I think 5000 is a good ballpark figure for this to be done by a reputable shop.
You are close to needing to get it done. I think the magic number in Bruce Anderson's book is 1 quart per 500 miles. The danger of leaving it too long is you could break a valve due to lake of heat conduction through the guide. I would try to do it soon but at most 1 year/5000 miles. (my opinion)
I would try to get 2500 off the price from the seller and buy the car. It sounds like a great car and the value will be higher after the engine work.
-Andy
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72 Carrera RS replica, Spec 911 racer
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