Welcome, its a 5.6, but thats besides the point, what type of issues are you having?
All wear out-able parts and replacing is normal on a used truck.Small leak in manifold, needs shocks and struts all around, front brakes and tie rods.
They're not visible enough to see the cracks. But if you create a new post in the technical section and add a video there are plenty of people who can help diagnose it. The sounds are similar though.The cracked manifold, is that maybe the sound I hear which sound like a leaking vacuum line or something? Any pictures of where the cracks are so I can look at mine?