re-installing rockers and push rods on chevy 3.1 litre?

i just replaced a head gasket on one side of the engine.

I understand that the engine absolutely has to be in top dead center.

So all i have to do is check the timing and then i can reinstall the rockers and push rods and then i can put everything back together ? ? ?
If i see the timing mark than that means i have tdc?
 
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