Billy Seebold USA was racing a Seebold with the big bore Merc T-4 (#7). Johny Sanders USA driving a Burgess boat with the Wizard..2 X Merc 2 liter power heads on one mid-section. (#8)
This weekend was very hard for outboard racing. A few days earlier we lost Tom Percival in the Liege, Belgium race.
Fact is that Barry Woods, USA won in his #35 Molinari/Martini/Evinrude V8.
Second picture.
Please read the full story from Powerboat & Waterskiing.
EDIT..
Fact and interesting reading about the Formula 3 race in Victoria Docks, London 1984. F3 was always racing at the same place and date as the F1-OZ back then.