Clarification: there may be roller-compatible profiles that can be ground on an existing cam, but the result will be much too mild to justify the expense: short duration, limited choice of LSA (just a guess: 4° change maximum), and low lift. It's also got to be a steel cam: all 1937-54 with small journal, 1955 large journal, or any 1956-63 engine using a 1955 cam.
