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I am no big expert on diesel injection pumps, however that keyed slot will get you close to correctly timed, but there is still some roational variation in the final locked down position the pump is placed in. It is normal for diesels (particularly older ones) to smoke upon throttle increase. Ike

Did you have someone that knows what they are doing install the pump? Alignment of the injection pump is critical to it being in time, it is not a simply bolt it up and its automatically right. I also suspect wet stacking problems here, an hour or two under 80%+ load might clear up a lot of...

If the injector pump is installed out of time it can smoke a lot, also did you have the injectors flow tested when you replaced the pump?