Well Sam, I did see and hear them at Paris - spine chilling stuff. OMC always seemed to be good for weird surprises in the racing environment, starting off with the GT115 and the loop charged 3-cylinder, continuing with the Stranglers, the CC and CCC, the Wankel and the V8s. Always a technological tour de force, with astonishing improvisation skills successfully applied to engineering.
After all, no outboard manufacturing company ever had the financial means of the giants in the automobile industry.
Being an engineer as well as a trained engine builder, I did enjoy live all of the above race engines, but only raced the 3-cylinder myself, in SE form. However, when I saw Angelo Vassena`s OE at Brodenbach, my eyes really opened wide!
I still have about five shoe-boxes full of docs and photos to scan and send to BRF. Might need some assistance with dating the lot. rgds.