Broken manifold studs on my 4.7 PITA!!!!!
Hummm.... I got a 02 Dak with the 4.7 and haven't had any problems. Only got 67,000 on it though. The best way I've found to get rusty exhaust bolts out is to soak them a couple days with PB Blaster and use an impact. The impact will knock the rust loose rather than twisting the bolts/studs off.
68A did the headers make much difference in how it runs? I bought a set of headers for mine a couple yrs. back and haven't been able to make myself install them yet. Don't know why I even bought them as I hate headers.