No break in at all for a roller.
The whole idea of the fast idle for 30mins with zinc-rich oil is to allow flat tappets to wear an intimate pattern on their relayive lobes while the fast rpm insures plenty of oil splashing on it to keep it cool, lubricate and wash away debris.
A roller eliminates the need for any of that.
Just make sure your temps are up before hard throttle. (as always), but don't be scared of hard throttle as cylinder pressre is fine. Just keep the rpm down for the first 1000 miles then swap oil and filter and you're good to go..
Don't use a synthetic or friction modified oil during this period.
Rechech the torque of all your fasteners after the first few heat/cool cycles -particularly the headers, and you may need to retorque your head gasket depending on brand/type. (check with manufacturer).