Matty Matt,
Cannot be done, since MotoRex's RB's are [supposed to be] modified from their original state, including but not limited to, EGR Valve, remapped ECUs, etc.
Assuming you were able to obtain all of the parts needed to replicate their modifications, including the ECU tune, you would only be able to use a R33 Skyline GT-R engine, as that was only one federalized by the EPA for street use.
That will be hard to do, unless you
a) find a federalized R33 GT-R where the owner is selling the motor for some bizarre reason with the smog parts & ECU
and
b) MotoRex actually bothered to add said parts.
No, 32's and 34's were not federalized for street use. MotoRex just registered them as 33's... 34's cant be legal cause they would need ODB2, and 32's cannot be legal due to various reasons (motorized seat belts & airbags, et al).
You can brush up on this kinda junk by paying a visit to FA's Skyline forum.
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