big block questions

I'm helping a kid with his 73 dart. Droppinga 383 in it right now and plans for a 440 later. Have a couple of questions. He has the eddy alum heads ordered for the 383 and wants to use them on 440. What headers work with the eddy heads and will the same header work for both the B and RB engines? He has been told it won't work but I think it should.

I assume the schumacher kit is the best to go with?

Thanks
Brad