Headers on a 250

[68gmc250]

Hey I'm new on here I have a 68 gmc short bed with the original 250 and 3 on the tree this is engine I've ever played on so far I've rebuilt the carb and replaced the valve cover gasket but that's it the exhaust manifold is broken around one of the bolt holes and my uncle is giving me a set of short headers for it and I was just looking for some information on what would have to be done to switch from the manifold to headers