Question for the learned masses here . . . . if you have totally stock, 5.7 with NO ISSUES other than high mileage . . .would you take preventative measure and replace timing chain, guides & tensioners ?? Or continue to just drive the car ?? Have 139k miles on my 2006 magnum, have NEVER had issues with 5.7, not even valve cover gaskets !!. . . so wondering if should think of preventative maintenance items prior to having issues.