Those are Crane Gold 1.6:1 aluminum widebody roller rocker arms. The AFR heads widen the intake valve spacing to fit a larger valve and recommends an offset rocker arm and adjustable guide plates. For this story, we were able to align the intake rocker, but you can see it is a bit “pigeon-toed.” For street durability, you really should go with an offset rocker. Crane makes a 0.150-inch offset (at the pushrod cup), and you will need four lefts and four rights to make this work properly. Also note this engine did not use a shaft rocker system despite the stratospheric rpm.