John - Whenever you see black exhaust it means the pump's injecting more fuel than can be burned.
You've eliminated intake/exhaust restricting air flow to/from the engine. And since you've had the pump rebuilt and the injectors tested, at this point I'd suspect the pump timing. Could be it's timed late. Or perhaps the advance is not not working. The pump shop should have checked that however.
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Today's Featured Article - Tractor Profile: Case VA Series - by Staff. V, VC, VI and VO). Althouh the Case VA looked much like the V, it shared no major components with its predecessor. Except for military units, the production of the Case VA was interrupted in July of 1942 due to World War II. It resumed again in 1944 and continued until 1953. It started up briefly later on in 1953 and continued on a very limited basis until 1956. The VA Series included the following models: VA: Fixed front wheel tread VAC:
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