the rails aren't bad but, if you are not comfortable with messing with something that than cause serious engine and wallet damage, I'd find me a qualified shop to do the repairs. I would replace the cahin, guides X 4, tensioner and look hard at the cam gears, reseal the oil tubes for the cams at the same time. (cam gear wear is not much of a issue with the double row chains but, will wear if run for long periods with a worn chain)
Project Smoker, '87 603 powered wagon
Hauler, 96 CTD can you say torque?
Toy 73 Cougar xr7 convertible
Acme Automotive Inc.