I have a 79 camaro with a sb 350 in it. I just finished replacing my head gaskets and put everything back together. It wont even turn over. Can anyone please give me any reasons why this would happen. Please!!!

 

Do you have power down to your starter, Ground hooked up?

 

Some Reasons:
Battery not connected
Battery dead
A ground cable (at battery or to the block) didn't get reconnected
You accidentally left your shorty ratchet in one of the cylinders
...
Did you try turning the engine over by hand while the spark plugs were out?