From what I have read, adjusting the engine to correct for p-factor is a bad idea. However, many plane that I have seem (remember I am quite new at this) have 1-3 degrees of left angle either established by the firewall or the mounting of the engine. Some will also have some down angle as well. My understanding is that the left is for engine torque and the down for p-factor, but I would not stand on that statement.

As for what you do to correct for p-factor...don't jam the gas, but roll into it. Correct for the left with some right rudder. The only time it is really a problem is when you are taking off.

The trainer I first learned to take off with was a hangar-9 easy fly 40 that had been converted to tail dragger. The instructor was so used to the left turn (it was his plane), he forgot to tell me to put some right rudder to it. I almost had the ting turned back towards us before he cut the gas and told me what happened. Then he showed me to roll into the gas and give it right rudder until you get the tail up. Once you have that, she flies like normal.

Zee