Continental IO-520A operating data?

Does anyone out there have power setting and fuel flow data for a
Continental IO-520A engine? These were installed on some 1970's era
Bonanzas, and someone whose opinion I respect mentioned that the power
setting and fuel flow data in the aircraft POH were based more on
marketing requirements than sound operating practice - that is to say,
they did not conform to Continental recommendations and were not good
for the long term health of the engine. Obviously the aircraft
manufacturer's recommendations are in the POH, but does anyone have a
source of the engine manufacturer's recommendations, or, failing that,
the recommendation of a manufacturer other than Beech that uses the
engine? I would like to be able to compare the two.

Michael