The N47 exhaust manifold is cracked on my 78 280Z. I bought an N42 to replace it. Elsewhere on the forum others have said that I can put an N42 (square port) manifold on in place of the N47. I had two questions, though:

- which exhaust manifold gasket do I use?
- The EGR ports and tubes are different between the two. How do you deal with that?

Thanks