manifold/head?

The intake and exhaust manifolds bolt together with three bolts near the carburetor.

I loosely threaded them and then mounted the intake and exhaust manifolds to the head. I then torqued the intake and exhaust nuts to the head, then finished with torquing the three intake to exhaust manifold bolts...

That way the ports for the intake and exhaust manifold can "fit" themselves to the head to be on the same plane for better sealing....