The 2 bbl and 4 bbl air cleaner mounting flange (top of the carburetor) opening are the same.
That is a 302 specific air cleaner housing. The 351C was larger and the top flatter as I recall (I haven't seen mine in a while, going from memory)
The radio shown is AM only, they also had am/fm optional.
There are some conversion companies that can rework the internals of the radio, making it am/fm and aux. input. the FM is indicated by an led placed in the display. This makes the external appearance of the radio to be stock, but have more modern conveniences.
Hth,
Curtis