Generally you can go up a point in compression to offset the effects of heat rejection by the aluminum heads (in your case 10.5:1 shouldn't be a problem). If your still giddy about detonation. When the engine is being assembled a few things can be done to minimize this; Polish the pistons to remove sharp edges, minimize the piston to deck clearence (as close to zero as possible) and look for pistons with a higher ring package so that crevice volume is minimized. (For that matter you might also want to consider a hypereutectic piston since it fits tighter in the bore when cold, however they don't tend to hold up to abuse as well as a forged piston. BTW if the piston is fitted properly,a forged piston will fit just as tight when the engine is warmed up). Try to get as much compression with a flat top piston as you can since flat tops or reverse dome pistons (expensive) tend to be the more efficient piston designs. Beyond this any thing that will keep the fuel/air misture homogenized will reduce the tendancy for the engine to detonate.
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