Thanks for all comments. I've seen the M119 (400E V8) conversion into 124 but it was very involved requiring changing engine sub-frame plus all electronics? . M117 Euro 380 is double row timing chain + a much narrower (at the heads) engine than a 500-560 engine plus 215HP, + mechanical rather than electronic FI could make it easier swap. There are some YouTube videos of working European M120 V12 conversions into 124 chassis so if that monster V12 fits into a 124 I'm assuming much narrower M117 will fit without much hammering and expense since all parts would come off a Euro 380 126. This has to be a low budget swap to make sense for me; no bottomless cash drawer available.!