You would have to call HS to see what the length of their TF rocker arm is. I know it is shorter than the normal rocker arm. (which I always thought was too long). I do not know if it is also 1.480 but I bet it is close. I think the HS rocker arm for Edelbrock and TF heads if 0.050 shorter than the standard Mopar rocker arm but my memory could be playing tricks with me.

I think I posted pictures of all of the rocker arms mounted up on a TF head back in one of the original TF threads. From what I recall, the HS, Mancini, Hughes and T&D rocker arms all had excellent geometry on the TF head. But, this is after getting custom T&D rockers made and using the short HS rockers. I was pretty careful to order the correct stuff for the TF heads and I ended up with parts that fit correctly.