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		Joe is correct that not all 3406 are E engines. I assumed it might be an E from the year you mentioned. That would be a rare beast. The install into that coach would be suspect. The Detroit engine is the way to go for these conversions. Solid as a rock. Excellent fuel mileage.
	 
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		I'm well aware Prevost won't help with the engine, but there are a lot of diesel mechanics well acquainted with the engine.  So far it runs great.
	 
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		I am glad that you are enjoying your new coach ... and happy that you are here on POG.  Safe travels!