Hi Sukram, I am restoring a 1985 4/4 like yours, I obtained my weber service kit ( gaskets and other wearing parts) from burtonpower.com. The kit comes with a good exploded view diagram.
I have been using a Haynes Ford Fiesta (august 1983-1987) manual and found it covers most of my CVH engine, except the gearbox.
Your air cleaner is an aftermarket one, possibly K & N.
philb
