Flat top or domed pistons

Closed chamber heads or open? I like going with flat tops with a closed chambered head and then go with a tighter quench. Depending on the type of rod you're using and how long the rods are, .025 piston to head clearance isn't unheard of. Right now I have a 440 with .070 (hate that!) and it produces 10.3-1 but the piston were on the shelf and the only stock bore slugs I had and didn't want to buy more. It's not a race engine anyways. Years ago a helper didn't check clearance and I thought he did and the engine ended up with .019! It ran a 10.0 right off the trailer but the owner wanted to use a small shot of the happy gas. The engine did fine for 3 passes until the button was hit and it split a cylinder right off the line.