Don't look like there's much
oil up top---some of the rockers appear to have an offset--are they on the correct position? Do the pushrods show any signs of rubbing the manifold?
Altho I agree that the grade five bolts are inferior to what is needed, they aren't the reason the rockers went sideways
If the pushrods aren't rubbing , put it back together with solid spacers and some good bolts .
Jerry