Update - now running using the GM crank sensor. What this means is there is now a viable alternative to the GM electronics that is fully tunable. I have a good tune file up for a stock 4200 so a person could install the motor, plumb and wire the MS efi system, install my tune up file (its just as easy as file open, save to ecm) and drive off.
The cost of a prebuilt MS is about $400. The only required change is you need to run a cable type throttle body off of a LS1. A simple adapter plate made in under 4 hours on the mill is all that is needed.
Video...
pardon the poor video quality - need more practice with the camera.
