66.5 is .100, which is going to require a big bore dome, with a 9° squish band angle.
Here in lies the problem. You haven't added any stroke but are using a 5mm longer rod, the blaster piston is a 6mm offset pin height. So if you were setting this up on a stock height cylinder with a stock thickness base gasket, the piston wouldon't come to the top of the bore. It would be .050" down from the top of the bore because that 1mm difference in pin height to rod lengths and that's including the .010" that a stock height piston with stock cylinder(height) and gasket would be below the top of the bore.
So what's your setup? Because at this point you need a dome with no step at all or a dome that has a squish band that protruds into the bore. Both of which are domes that no one has made and no one will make because it's just the wrong way of setting up stock stroke long rod.