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Pretty much any 4.3 V6 from 1995 to 2005. For the exact same ones, that would be 1996 to 2002 model year. As for doing an engine swap, you can swap in a number of different engines, if you have the time, money, resources, and know-how. A GM small block could be swapped in, or you could swap in a 3.9 Cummins 4BT or 3.9 Isuzu diesel (for the latter, adapters are more readily available to mate it with the 4L60E transmission in your Astro).

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10y ago
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Q: Which engines will interchangein 99 astro vans?
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