Let me set this straight
Ecu wise you can concider 4 different types.
A-03/early 04s use narrowband o2 sensors
B-Late 04s and 05s use widebands
C-all 06 and the track 05s are rev ups and use an ecu that controls it
D- 07-08 are all HR motors and uses that ecu
Each of the 4 types of ecu has a harness that must match (modification can allow changing them)
Ok. But there is only 3 motors
1- vq35de non-revup (can use a or b but the harness needs to match the ecu)
2- vq35de revup (uses c)
3- vq35hr (uses D)
So I can use an 03 motor with my 05 ecu and harness. Or even visa versa.
To keep things carb legal you would have to incorporate the evap system which gets pretty elaborate with the fuel tank and canister setup but is very doable. There is a thread on here with someone who pretty much put the entire 350z in an s14
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