K-jet manifold opening is 2.600" (you do the conversion!) which could probably be opened to 2.800" or a bit larger with no problem. The actual throttle body, at its narrowest point (right at the butterfly) is 2.520" widening to just a hair under the 2.600" width to match the manifold.

The D-jet has been converted to MS by, I believe, Barry up in Washington State. He's got a link around here somewhere to his page detailing the procedure.

I'm going to go with the Ford 19 lb. injectors in my '85 500SEL. It means I need a fuel rail made but the availability of the injectors ($20 for a set of 8 from the pick n pull) makes the decision for me. I've got a place which will do all the drilling and tapping of the rail for $120.

You still need to adapt a TPS to the throttle body since the existing TPS's are SWITCHES and not sensors.