Headers or Intake first?

Won't matter really. On that the headers will drop in without a wink.
Hey Mr. 'willrun', I wonder what you mean by that? I have done small block A body headers probably 10 or 12 times, and I never had them "drop in without a wink". Did you just mean that the task wasn't really all that bad? If you unbolt the motor mounts, and lift the motor up they go in fairly easily (right side usually much easier than the left. But I have never had them drop in with a wink. Is there a trick I am missing? If so, please share.