hey Matt id love to see pics of that conversion. How far away are you from starting the engine? What do you do with the old cam gallery in the block? do you just block/plug it up? the mazda heads x-flow a, which sides the inlet/ outlet? if the inlets on the other side youll have probs clearing the brake m.cylinder with the carbs. (like the other 'mysterious' twin cam pic in the photo album). looking forward to seeing it. one big step for Matt, one big step for datsonkind.