Hawk head gasket

[Lit Hawk]

So I’m replacing my head gaskets and I took off the cylinder head no problem but I’m not sure how to remove the block is it just two bolts on the left side holds no it on? Also when I removed the cylinder head there’s these round washer type things going over the bolts. I only had 3 on and only one has a rubber seal do I need these? Is there supposed to be 4 on all bolts ? Also my gasketwhere the muffler attaches to the clamp it fell apart when I removed the muffler how do I replace it if it does need replacing at all. Thanks