Seems like that would be legal... SM also allows all Stock and Street Prepared rules... and SP allows updating/backdating of parts including entire engines.
Street Prepared:
Quote:
14.1 Authorized Modifications
3. Equipment and/or specifications may be exchanged between different years and models of a vehicle if
(a) the item is standard on the year/model from which it was taken,
(b) the years/models are listed on the same line of Appendix A (Street Prepared Classes).
The updated/backdated part or the part to which it is to be attached may not be altered, modified, machined or otherwise changed to facilitate the updating/backdating allowance. The updating and/or backdating of engines, transmissions or transaxles must be done as a unit; component parts of these units may not be interchanged.
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I guess a Japanese-market-only version of your US-market car would just be another model that you could take parts from.