[Alan Roehrich]

I'd only use either of the Dart blocks. I think the SHP block is fine. The thing about Hard Block or Embeco block filler is that it also provides thermal stability. The SHP block is considerably thicker and stronger than say in "010" production block. "Pouring" the SHP might not be an absolute necessity, as I feel it is with production blocks, but I still prefer to pour my blocks.