84' 300D

What length of head bolts do I need when replacing the head? Are they all the same or are they different lengths and in different quantities? If someone knows that information please post.

Also, what size 12-point Torx tool do I need to remove the head bolts?

Lastly, when removing the head is it easier to remove the cam sprocket and hold the chain or to simply disconnect the chain and keep it in place?