1967 273 Engine w/ adjustable rockers, 4bbl

HemiFC said
I believe it is a commando engine based on the intake and rockers. I cannot say for certain what pistons it has in it, so I cannot guarantee that it is a commando engine.

The 64-67 2 bbl 273's came with adjustable rockers as well, which is why you need to see piston tops to verify if its a Commando or not.