Anyone ever run Speedmaster Heads on their small blocks

I've got a set of complete ProMaxx 171s I got lightly used for about the price of the SM bare. They look good to me but I don't know much. I'll be pulling them apart this winter. If all goes well I'll throw them on the '71 340, but I need to make sure I can get the right head gasket thickness. I don't know what pistons are in the motor and these are small chamber heads so if the pistons are above deck, I need a thicker gasket. I have to make sure the gasket doesn't need a special surface prep because the engine is not coming out for this. I thought I read that the Cometics you can get thicker need a very smooth finish.
For the record, mine are setting behind the bar in the basement.