Rocker arm side play

Is your motor basically stock? If so, I would not spend the money for roller rockers just yet. If you get ready to build / upgrade your motor then you'd want to go for the good stuff. If the motor has been basically running OK I would probably put the stock type set up back on it. Also, you have to remember that the stock stamped steel rockers aren't exactly a super precision machined piece either, and as they get some miles / wear on them they'll just get worse.