i got my replacement cylinder head and my gasket should be here tomorrow. when i pulled the old head off there were these little pipes that got bent when i smacked the head. i looked them up on the microfiche and they are called dowel pins. i didn't get replacements when i got the head and they don't look like they come with the gasket. how necessary are they? it looks like they just hold the head in place during assembly. is that accurate? can i do without them just so i can get this freakin' thing put back together?