Black smoke is probably from injection timing, assuming that injectors are new and the pump is correctly adjusted.
Looking at the manual, it would be easy to not get the timing exactly right, especially if you do not have the proper timing tool, and not too hard to get the pump drive gear out by a tooth. In addition, it needs to be noted that a loose timing chain, possibly due to an issue with the tensioner, will also affect timing, and, of course, getting the camshaft timing a tooth out would also have similar effects.
John
JDNSW
1986 110 County 3.9 diesel
1970 2a 109 2.25 petrol
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