Sorry that I don't have any technical advice that will help you, but I was just thinking what a sweet conversion this would be for a W126 300SE. That would really be one of a kind. You would then have a 300SE with more HP than a 420SEL!
Mike, do you plan on taking pictures and perhaps making a step-by-step webpage? I commend you for taking this on! Good luck and keep us posted.
'86 420SE Euro
904 Midnight Blue, Gray Velour
Dad bought it new, now I own it.
"A Mercedes-Benz is like a fine wine, it only gets better with age."