I have over 252,000 miles. The head has been done but the block is all original. My car is really strong. It has good response from 1500 to 6300 rpm and can get good mileage up to 25mpg. I have a few scratches on the cylinder walls which contribute to increased oil usage. I get about 2000 miles per quart depending on the amount of freeway driving. There is a post on the tech help from a fellow trying to determine the usual problems that these cars have. Valve seals and head gaskets are common problems.
Good luck.

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VR
1967 250SL