RE: 90 lx?
Hi Steve....
Stick with it... you will really enjoy the engine.
You are wise to be cautious of a lean run. No problem there. It is always safer to error on the rich side.
There is no technical reason to be afraid of the rpm and power. On the sticks ..... ok, its ok to be a little affraid [&:]
Just start off with the 11x7, check the rpm. It will be easy on the engine, you will see a rich exhaust, and it will stage on the pipe without a second thought. Don't worry too much about the low end until the top end is pretty close.
Running the 11x8 later on is no problem at all. We have found through experience with this engine in a few different airframes that the 11x8 seems to give a very good balance of performance in the Patriot XL and on the Cermark jets.
Keep in touch here..... let me know how things go. I am always willing to help out.