It is not the MAP sensor that is causing the errors.
The problem is actually very simple. The ECU has a failsafe (well, it has many, one of which is this). It has information on what kind of intake manifold pressure to expect from a certain opening of the throttle valve. It also actually measures that pressure. When the two are too different it will see this as a problem and issue an error code.
I would assume that the 68mm TB works with Vocky's setup, as he already had ported this head, bigger valves, other cams and different exhaust. That would imply that the air is flowing easier through his engine which would lower the intake manifold pressure and not cause the error.
Would be easily verified by someone who already has cams and will fit the 2.4 intake with the 2.4 TB.
Mark