The problem with kit headers is that they are designed to fit a specific kit, and won't necessarily slip into a different chassis regardless of engine fitted. When trying to find a set of kit headers for a build I don't worry about what engine they were designed for, they aren't made with enough detail to tell the difference. I'm not sure 1:1 headers are.
Al you have to worry about is the exhaust port configuration, of which there are two main types for American v-8s. The small block Mopar and the small block Chevy share the centre siamesed port arrangement. Many other GM cars do as well, so any of these could be potential doners.
The problem is, will they fit a given chassis. I keep all of my spare sets of headers in one box. When I need a set for a build I dig out the box, find all of the headers with the proper port configuration, and try fitting to the mocked up chassis to see what fits. The vast majority won't properly without significant modification, sometimes to the point of pretty much making a set. I have a stash of a few hundred kits and will dig through a few of them as well looking for headers if the spares box fails to provide. And I still may of find a good set.
The reason I mention all of this is that it can be nearly impossible to offer solid advice on a set of headers that will fit a specific engine/chassis combination without personal experience the build. I have a couple sets of headers from Chevys and from small block Mopars, and I will happily offer a set up, but the reality is they may not fit. For the same reason, buying a kit for the headers sould only be done if you want the kit anyway, as they just may not fit.
Anyway, just cautioning you to the reality of providing header fitment advice or suggestions. If you are interested in a set I may have, send me a PM.