I have a motor with about 62,000 miles on it since a rebuild. Ran strong, but last I ran it, you could here a clicking from the lifters when it would first start up cold. It would go away as soon as they pumped up. Would just throwing a new cam and lifters in it be alright without having to change cam bearings and all that? I don't want to have to rebuild the whole motor since it runs so good, but I don't want to run it if the lifters are getting worn.