shim the rocker studs????

Irony of it all is I have an rv that was givin to me cause it was stuck in there yard that brought home and stripped the camper off and someone had the motor rebuilt and it's an la 360 that will outrun all mu other dodges after I put a hei ign and a holley on it so the best thing I got was free ! And they say god doesn't have a sense of humor. Lol