Yes, long story short, after replacing pistons, decking block, surfacing heads, the engine builder used a thin head gasket and that's what the compression wound up at.
Not to beat a dead horse, but what pistons? You/someone would need to have purchased a domed high compression piston which are normally reserved for racing. You cannot mill 906 heads and deck the block to 11.2 CR with a typical replacement type piston.
