You probably get more then 9.5.
Those pistons have a CR of 8.0.
You have to cut them at least 6mm down.
The recess in the piston will then be about 3mm deep.
Now you compress a larger displacement in to a smaller chamber.

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76 240 D. Bought in 1998 for $25.
85 300D. Got it for free with a bad engine. ( Sold )
60 Unimog 404. What was left of it, was given to me. Now powerd by 617A.
88 560 SEL. Bought without engine and trans. Now powerd by 617A.
67 250 SE. Cuope. For resto or sale.
64 220SE. For resto.