before you choose to "repair" your engine, keep these points in mind
1 you need a brand new genuine crankshaft pulley/timing gear bolt
2 you need brand new cylinder head bolts
3 you need new connecting rod cap bolts
4 you need a dial gauge to adjust the injection timing
5 you need a proper torque ratchet to tighten all engine fasteners.
6 you need proper flange sealants to seal down the engine
7 your engine coolant passages should not be corroded from the cylinder head or block surface - and you should only use a diesel rated coolant in it along with its original thermostat valve.
you need to follow correct procedure to adjust valve tappets - no grinding etc of the valves or buckets, if the buckets are collapsed you need new buckets (bucket = tappet follower aka dabboo in mechanic terms)
your injection pump should be tested on a flowbench for correct injection volume and delivery both with and without boost of 8 psi (OE boost pressure)
Ideally you should test the compression pressure first, diesel compression testers are expensive to buy as they measure near 400~500 psi of compression pressure in the cylinders.
If you follow the correct procedures the engine will start at a flick, be very reliable, quiet and cheap as a CD70 too.