You can get the Icon's in .040 over off the shelf.......the flat-tops have a 5cc relief and according to your specs will end up with a static CR of approx. 11.7......the closest dish piston they offer takes you lower the other way......you could use the flat-tops, but you would need a .082 head gasket to get you to 10.7....??????
They are also a pretty heavy piston (although we have the .030 flat-tops in our 408....lol)
I found the piston I needed. the IC475 is a dish and +20 and with a .022 gasket gives me
Not sure who offers an off the shelf piston that would get you closer with your heads...????
Rickster