69 440 Exhaust Manifold Bolts

[Davtona]

On a 1969 440 what markings should be on the head of the bolts holding the H pipe to the exhaust manifolds? I 'm referring to what is assembly line correct.   

[Sublime/Sixpack]

The closest I can come to what you're asking for is this photo of "Original" bolts, nuts and retainers from my 1968 Coronet's 318. At least this may give you an idea of what your 440 may have come with.