Brilliant research work! however there were also marine versions of many of these engines. In general the marine motors had bigger valves and wilder camshafts and amazingly high power outputs. Horsepower figures all need to be taken with a very large grain of salt as the quality of fuel has steadily declined over the years (5 star went yonks years ago). Once emission control was introduced power went down yet again and then they banned leaded petrol. The present ULP is OK for lawnmowers and chainsaws but it will cause valve seat damage in a lot of engines. Some cars just won't run properly on ULP, for example a friends classic Mercedes 230 (are we allowed to say Merc?) misbehaves when required to pull a small two berth caravan! That's absolutely ridiculous for a 2.3 litre car, but it was probably designed for five star fuel. Petrol aint petrol anymore!
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