The drawing you have is for something different...maybe an earlier model F-series engine. The parts schematic is below. There is no "kit" and most, if not all of the parts are discontinued. As long as the flapper inside the exhaust manifold is in good condition and moves freely, you should be OK, I think. Often there is a crack in the intake manifold that can be seen looking down into the manifold where the carburetor sits.
Pay attention to the gaskets and insulator that go between the intake and exhaust. I think the insulator is still available and if yours is damaged, replace it. Otherwise get two new gaskets and attach the intake to the exhaust making sure the surfaces that mount to the head are all in one plane.
View attachment 3283477