My buddy is about to fire up his 50 Ford w/ freshly rebuilt Flathead. His cam was reground and has new lifters. The machine shop guy that put it together said it doesn't need to be broken in like a normal flat tappet cam. Is this true? He said just fire it up and drive it like normal. This is (Obviously) my first flathead rebuild and never would have thought this was true. Any other insight on its first fire I should know about?