Well, I couldn't let you all hog all the fun, so I'm in progress of rebuilding a Euro '82 500SEC engine, and have most of the parts ready to swap to MS as soon as I know the engine runs.
Little things like TPS and figuring out my solution to the air filter are still rattling around my head, but most of this seems to be coming together fairly smoothly so far.
(Having said that, I probably caused myself some unforeseen headaches, but hey, these things have to be done!

)
I have to ask, though. What have those of you who have the engines running done about fuel pressure regulation?
Per the CIS troubleshooting manual I have, the '80 and beyond source pressure is listed as 5-5.2bar (~85psi) and all the Mega Manual warnings seem to point to never allowing the injectors to see anything above 70psi, and typical running pressure being between ~38-46, depending on the OEM.
If need be, I'm willing to go spend on a good aftermarket regulator, but I wasn't seeing any mention of these in the MB conversions I've looked at.
Thanks for any input!