Quite often when you find a D24T engine, it has not been run on synthetic oil and the piston rings are very worn.
Hard to start, smoky, high oil consumption. Mine had 1/4" piston ring gaps on good bores. The top end will probably also need an overhaul, new valve guides etc.
Cracks in the cylinder heads between the valves are commonplace but they rarely cause problems and can usually be ignored. Pressure testing would be advisable however.
You need a good set of glowplugs and no 5 and 6 are not easy to replace.
Put new timing belts on before you do anything and you will find holding the crank is not easy. If you have access to the flywheel end then it would be easy to bolt a plate between the flywheel and bellhousing.
If it has been sitting a long time, quite likely the IP will have fuel leaks.
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