""does the heads have air injection holes drilled in the heads?""

I am not sure what this means, so I have attached a photo of the heads before I bolted them on about 6 years ago. They were rebuilt and the bowls were blended.

7434080-DSC00367.JPG (37 downloads)

1970 YO7 A66 [Canadian Export] F8 Challenger
340 (Currently in shop for stroker assy.)