My roller rockers are hitting the 2 narrow ends of the valve covers, ok, what are my options here? i was just pounding em out with a ball peen hammer, but how can i be sure theer not hiting w/out putting it all back togther and firing it up, also what other valve covers will fit on there? what is different about fox valve covers, etc. and last, if i go the new covers route, where can i get some nicfe ones that will fit? thanks!