Now thats a question thanks Stephan!!!!
The ideal exhaust temp is different for every motor as much as 200 degrees F,,
but in general around 1250-1400 degrees F is the goal!
Now for max power you have to play with fire because max power is achieved by borderline melt down a fine line,,not recommended for street and road course
but a mission in drag racing!!!!
The best way to find out exhaust temps and rich lean is lots and lots of dyno time!!!!! money well spent even though it costs $60 an hour plus fuel or you could bring your own fuel!!!!