Hi Marka10,
I've put many a head gasket on A10s in the past, cast and alloy heads. Always used solid copper (annealed) gasket, never used jointing compound.
Make sure that you torque up the head bolts in the correct sequence - a bit at a time but always in the correct sequence.
Run your engine/bike for a wee while, cool off then tighten the bolts again to the correct torque which I think is about 30lb ft - please check tis figure elsewhere, my memory is getting old.