Re: Speed Density to Mass Air
You can plan on spending about $600 for a Motorsport mass-air conversion kit. It comes with an overlay harness to convert from bank to bank to sequential injection, an EEC module calibrated for the stock 18 lb/hr injectors, a mass air meter, and the adapter to go to the air box.
You can price out the pieces at a junk yard and compare to new. If you plan on going to the larger injectors, you may need to get your meter recalibrated to accomodate them.
I have a single orifice on my throttle body that I converted from the twin throttle body that is standard. You will have to fabricate your own brackets to hold the cables in the proper orientation to the TB cam. You can get larger than stock throttle bodies through Summit, or PAW. Plan on another $300 or so.
No experience with a trans module.