Yeah, if the head is off, that's a good time to confirm the zero timing mark on the damper is in proper alignment with the tab.
Just be sure when you line it all up that the #1 intake valve closes , then the distributor rotor points to #1. I put a small block Chevy in 180 degrees off one day, and was slightly embarassed when flames shot out during initial start.
But if all you're doing is bolting it back and getting the right teeth on the cam chain, then it's a pretty wide margin - if you are one tooth off, it's pretty obvious. The slight change in cam timing due to head milling is virtually insignificant in that case. You'll definitely know when it's right.

Oh, don't turn the engine backwards by hand, the chain guides and tensioner frown on that.

DG