Edit: I should mention he didn’t need the W2 offset for that head, but he did it because it’s near impossible to find TA offset rockers. At one time MP was making them but I don’t think they made many sets of them.
I used W2 offset on my procomps because I already had a set of W2 ductile rockers. I had to mill down my rocker stands for offset blocks to move the ductiles away from the valve. A LOT of work, and I hope it will be worth it...
