engine swap

i have a 1994 chevy astro van with a bad motor 4.3l V6 fuel inj.i want to put a motor out of a 1993 chevy astro van 4.3l V6 carb. in it. how much trouble is it? will it work and what all will i have to switch?
thanks for any help.
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kalley wrote:

Rebuilder site can help with some of the differences:
http://www.psengines.com/GM6.htm
http://market.autopartsfair.com/search.html?make_id &part_type_id%&part_id89
Bob
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