Here is something else to consider. With a lot of engine blow by and driving the car at high rpm's, you may have oil soaked your air filter. This would result in choking the air from the engine and causing a lot of black smoke. As the other folks have said, black smoke is caused by too rich of a fuel mixture which is also not enough air for the fuel being injected. I don't know if the Alda would completely compensate for the restricted air flow.

TimK

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EPA 609 & 608 HVAC Certified
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83' 300D Turbo - 300K + Miles
00' 1.9L TDI Beetle
85' 6.5L Turbo, GV-OD, GMC Suburban,
67' 2.5L Diesel NA - Land Rover Series IIA

Here's what you do if it's so cold your diesel fuel gels. Smear some on some toast and stay inside until it warms up outside.