The consensus seems to be :
Iron block/Iron heads: set per cam card or maybe +.002 Most say per card
Iron/Aluminum: -.006
All aluminum: -.012
There was a good procedure on the Bullet: set cold per above, heat cycle engine once or twice. Run engine to op temp, then set one one cylinder to hot spec per cam card. Let the engine cool, take a reading on that cylinder - there's your cold lash for that engine combination.