trash the AEM and get an FJO with the NTK sensor, it will hold up to the leaded gas and i love the led display above the steering wheel, its awesome. slightly more expensive (sensor alone is $250) but well worth it if you run a lot of leaded fuel.
The AEM you can't run anything other than the bosch sensor. You cam get the innovate unit, or the NKG unit which both support the NTK sensor. Also the NGK is only $260 IIRC (about $100 extra for the NTK sensor).