Is it really worth the cost and effort to swap out an Edelbrock RPM intake for a single plane intake like a Street Dominator with throttle body EFI? I currently have a 1" spacer under the TB on the Eddey RPM intake and it works very well. Hood wont close now. Running without the hood is super cool BTW
I believe your overthinking this. As long as the map sensor can see vacuum from both planes it should be fine. You could also "program" the EFI to work if the map sensor only was on one plane, the other plane should be about the same unless there is a problem.
Speed-Density EFI really only has a few sensors (I think just about all the aftermarket EFI are speed density, not mass-airflow?):
1. Throttle Position Sensor (TPS). How far open the throttle is, and how fast is the throttle opening/closing.
2. Engine RPM from Distributor or other trigger device. How fast is the engine spinning. If Sequential EFI, which cylinder is firing.
3. Manifold Absolute Pressure (MAP). How much pressure (or vacuum) is in the intake manifold. Also, indicates engine load, and normally used to set the regulated fuel pressure across the fuel injector.
4. Engine Temperature Sensor. Is the engine cold or warm, used to calculate how much fuel is going to stick to the intake and port walls for temperature related enrichment.
5. Intake Air Temperature (IAT). How hot or cold is the intake air. Again to trim the fuel enrichment based on temperature.
6. Exhaust Oxygen Sensor (o2 Sensor) and that is just when in closed loop, using the O2 to adjust the fuel mixture.
7. On some EFI, might have a flex-fuel sensor to modify the fuel curve depending on the amount of alcohol in the fuel.