Hi Ken,
If you remove the exhaust manifold and clean the mating surface on the head you will find a number stamped into the head that matches the serial number you have pointed out.
If it matches, the head and block left the factory "married". If they do not match the head has been changed during its lifetime.
Just as a sideline, a clamp is not used at the connection of the exhaust manifold and the header pipe.

_________________________
RAY Member Chat Group - Non-Geographical Region
Chevradioman http://www.vccacolumbiariverregion.org/If I had known that growing old would be this much fun---I'd have done it sooner!