68 396 Casting number?

I am restoring my 68 396 camaro and I want to get the right block for the restoration. What is the correct casting number I should be searching for. It was an original 375 hp car. Thanks

You can find info here on what blocks were made back then...may help some.

If you ever re-visit our site you might find what you are looking for here.   http://www.camaroforums.com/m_79309/tm.htm