I just had a new set put in my 360 build. The back side of the rocker had to be ground down to clear the spring retainer. They show some evidence of clearance from PRW but it was not enough. Other than that so far so good.
Been there ,done that. The builder that prepped my heads and sold me the PRW's replaced the springs and retainers with beehives. Problem solved. I just had it apart to replace the Crane retro lifters with Hughes rollers and the rockers looked great