Yes, they are disco'ed....

What is the ID of the rockers you have?

If they take something other than a standard OD shaft, give RAS a call. They can probably get you taken care of.

72 RR, Pump gas 440, 452s, 3800 lbs, Corked, ET Radials,. 11.33@117.72. Same car, bone stock 346s, 9.5 comp, baby solid. 12.24@110.