The reality is, a W2 small block is probally not what you want if your looking for a mild crusier, AND......depending on which head casting you have, you might need W2 specific headers, your going to need valves/locks/retainers/springs, then you need rocker arms. Add a good amount for cleaning, machine work and assembly. They are awesome heads, but not needed for a mild motor. Much more aproperate plan would be a set of EQs, sell the W2s and don't look back. All out drag race motor would be a different story.