First thing you need to do is share with us what you used to paint the block so that everyone will know what the correct color a stock AD Chevrolet truck engine is supposed to look like (even though this is neither stock, nor Chevrolet).
Does anyone know what company built this head? The 45 degree input ports rule out most 12 port GMC head builders. I know that the Fisher heads had 90 degree intake ports. Plus, all of Horning's heads were cast iron. The head in Mark's picture at the top of this thread looks aluminum to me.
The two piece valve cover looks like a Bill Fisher part, but the only one I've ever seen had "Fisher - GMC" cast into the top.
