I would suspect you have some injectors that are not spraying a good pattern. They are firing correctly but with a poor pattern. After the engine warms up it will burn the poorly atomized fuel better than it will cold.
Many times an injectors wears or plugs and sprays a stream rather than a mist. This larger particulate size does not burn as well as a smaller/finer mist.
IF you can afford it I would have the injectors tested or rebuilt.
Doing an engine overhaul without changing the injectors is kind of like showering and putting your dirty cloths back on.
The injection pump can be out as well but with good injectors the motor will usually not smoke.
Valve adjustment will usually not make an engine smoke.
Also did you use break in oil??? The newer oils are too "slick" for a low powered break in. You can't grind feed long enough to really seat the rings in like you can on a dyno.
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Today's Featured Article - Grain Threshing in the Early 40's - by Jerry D. Coleman. How many of you can sit there and say that you have plowed with a mule? Well I would say not many, but maybe a few. This story is about the day my Grandfather Brown (true name) decided along with my parents to purchase a new Ford tractor. It wasn't really new except to us. The year was about 1967 and my father found a good used Ford 601 tractor to use on the farm instead of "Bob", our old mule. Now my grandfather had had this mule since the mid 40's and he was getting some age on him. S
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