The link I gave is to the engine Type Certificate Data Sheet. It is one of the prime documents in the maintenance publication hierarchy. The Pilot's Operating Handbook would be at the other end of the scale.
The Continental publications should be used, the POH often has limited info.
I was just corresponding with Piper a couple of weeks ago about the POH for another aircraft model. In that case the first amendment in over 20 years had just been issued, I was a little concerned that an AD from 25 years ago had still not been taken into consideration.
I think the figures being bandied about here are just 'rated' power, it has little to do with the actual power that could be developed.
The Continental Operators' Manual will have a variety of graphs and charts which may answer the question better.
The POH is just a handbook, - literally.
I am sure I have seen links to these various books available for free download.
They will not be current but will do the job for you.
Red Sky Ventures Free Aviation Downloads