CM2350 recommendations

[Chamberpains]

More than likely the new ESN on the valve cover would tell you a little about the engine if you registered it with Cummins quickserve. https://quickserve.cummins.com/info/index.html

If its the same ESN as the original engine in the truck than it is definitely a rebuilt or overhauled engine and they reused the trucks valve cover. There are other ways to tell what you have but it takes a little bit of knowing what to look for. The engine gods on here may be able to point out these things.