Technical Question on GM 6 stove bolt cylinder head bolts

There are both long and short cylinder head bolts. Can anyone tell me where the long vs the short ones go? Thanks

 

Longest on the rocker stands
next shorter at ends of rockers
Shortest at manifold side
Good idea to purchase a Service Manual

 

Doesn't one of them have a oil hole in it somewhere for the rockers?

 

57 up center bolt

 

There are three different lenghts. The rocker arm stands are not head bolts. But there are some that you have to get to under the rockers.