Air cleaner would be a good start, disconnect the cleaner from the intake just for a test.
Easy enough to test the lift pump, could cause the hard start but not the black smoke.
Sounds like it could be leaking injectors. The leaking seals that were replaced... Did that involve opening the pump and lines? Any possibility something got in the pump or lines and is now in the injectors? Might take them off and get them tested and set.
And if the injectors are dumping fuel, the oil could be contaminated, explaining the white smoke from the breather.
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Today's Featured Article - Oil Bath Air Filters - by Chris Pratt. Some of us grew up thinking that an air filter was a paper thing that allowed air to pass while trapping dirt particles of a particles of a certain size. What a surprise to open up your first old tractor's air filter case and find a can that appears to be filled with the scrap metal swept from around a machine shop metal lathe. To top that off, you have a cup with oil in it ("why would you want to lubricate your carburetor?"). On closer examination (and some reading in a AC D-14 service manual), I found out that this is a pretty ingenious method of cleaning the air in the tractor's intake tract.
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