truck trailing arm setup???? man now you talking hotrods to hell setup. that'll handle very nicely. i was giving it some more thought about the front end you are getting. if it had a BBC, the motor mounts are same as SBC. but the inner fenders may have been hacked up for the headers. and if he went with an aftermarket setup(heidts, TCI, etc) possibly he might have taken the core support as those don't come with one and you would need to reuse it.
either way take lots of pics. and keep us posted
