Apart from the physical dimension problems it is do-able from an Electronics point of view.
The easiest way would be to use a pre- '99 DOHC 4.6 EECV and recalibrate with a TwEECer. This would allow pre-returnless fuel system and will be compatible with the existing crank encoder sensors etc and will allow retention of COP(coil on plug)ignition.Or you could go for an earlier version and use four double ended coils with leads.
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