Re: head swap!!!!
11:1 CR? Why? Is this a race engine? You're running the very ragged edge even with aluminum heads unless the guy who suggested them figures you're bleeding off compression due to the high duration of the cam. As far as the pistons kissing the valve, you can do all the math you want but you won't know for sure until you mock it up and put clay on the piston than measure how thick the clay is after the valves make their impression in them. From Racing Head Service:
Engine builders have found that all you need on the intake side is the total amount of deck clearance plus .010”-.015” for piston rock (pivoting in the bore wall). On the exhaust side, you need 2 to 2 ½ times the clearance you have on the intake.
If aluminum rods are being used, add a minimum of .030” to these suggested clearance figures, as they stretch and expand more than steel rods.