Looking to swap in an 07 3.7 into my 06 (bad head). Found one with less than 4,000 miles on it and can get it pretty fair, but it has been sitting, in the truck, in the junkyard since 08. They told me they would test it to be sure it runs and doesn't have any leaks. They would offer a 90 day warranty as well. What do you folks think? Besides the obvious corrosion, fuel, rubber worries...what other problems would a motor like this have?