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From my reading the 004 was originaly used for the '73.5 and early '74 2.7. It changed to the 006 on later 2.7 engines. The air metering plate is probably different also, with a different venturi shape. This would affect the air fuel ratio at part throttle load, but I would think that it can be substituted without any problems.
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Ed
1973.5 T
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