Use a 6 point socket NOT made in asia or you will have round bolt heads

Also use the mr gasket .029 head gaskets, they are cheap, good and give you the most compression and on magnum motors help mpg/tq. Kind of like shaving the heads .020 for free.

If you have magnum heads don't bother looking for cracks, it has them. If you are concerned get them pressure tested, they don't cause any issues because the water is so far up above the cracks.