I have this engine in a T34 Mentor.

I run an 11x6 APC and #8 OS plug.

One thing I have read about the ASP engines is that "some" of them leak air around the high speed needle.  Something about the notch in the needle not being right and the rubber o-ring letting it leak.  The easy fix for this is to cut about a 3-4mm long piece of fuel tubing and slip over the outter portion (where you turn it to tune) of the needle and the fitting it goes in to seal it.

I did this to mine before ever running the engine.  Also...if done correctly it will not let vibrations turn the needle by itself when the engine is running.

Although mine is new and only been run for break in on the starting stand, it runs up good and seems to make good power.

I have a 40 size Extra 300s I think I am gonna put another one of these in.  Should do it good.