rjm, I would check the manual to see how you adjust the throws for your ailerons. If the manual doesn't show you how to do it, talk to one of the guys at your field when you go there. I'm sure they'd be more than happy to show you how to adjust it. The way it looks now, you are going to have a slower roll rate than is recommended by the manufacturer. I would think everything would be ok, but take my word with a grain of salt on this as I am relativley new to flying (1year) and my plane was set up for me.

As far as the engine goes, I would go ahead and run a tank or two of fuel through it just to make sure everything goes ok. I would do this at the field where someone with experience can also check it out and make sure the engine is adjusted properly. Hope that helps. Good luck