Shaun,
dont worry about anything until you get the push rods in there.
In pic #3 it looks like the trunion or rocker pivot is upside down. Rotate it 180 and you should be seeing a flat machined area where the poly lock sits.
Do a search here on --push rod length-- and read how to check for proper push rod length.
Make sure you soak the rockers in oil before assembly. They only get splash oiled.
Be good, Jim