...there is an automatic mixture control, (amc), inside the carburettor that does it all for you. it is an aneroid that changes the jet setting as you climb...
That's correct!
Do never lean!
I was flown with my B47G3B1 from 1'400ft up to 15'700ft to the Montblanc without any problems.
All temperatures in green arc ... and NO lean
http://www.adpro-ltd.ch/bilder/20060316megeve/index.htm