I think the radial can be slightly faster on a well prepped track. I have heard that it is not as forgiving of poorly prepped surfaces as the bias ply, which seems to agree with my experience with that tire.

I have timeslips with 1.6 second 60' times that show the radial is great on a well prepped track.

The ET street radial is not a "street" tire in any sense but the legal one.