The pistons might be fine. They need to be measured. Valves might be good too, they'll need to be looked at. I did a 115 240 about 20 years ago. I think the parts were somewhere around 2K?

Did you check the valve clearance now?

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[SIGPIC] Diesel loving autocrossing grandpa Architect. 08 Dodge 3/4 ton with Cummins & six speed; I have had about 35 benzes. I have a 39 Studebaker Coupe Express pickup in which I have had installed a 617 turbo and a five speed manual.[SIGPIC]

..I also have a 427 Cobra replica with an aluminum chassis.