Ginge, keep the old head bolts, they will be handy when putting the head back on.

cut the tops off two of them with a good hacksaw, cut a groove at the top and screw them at opposite corners of the block.

Then drop the head gasket on, and use them to guide the head onto the block.

Then fit all other headbolts (new) and use a screwdriver to unscrew and pull the guides out.