Here are some pictures of mine - B20, late model (1970), RHD. Also a copy of a page from the parts catalogue, but that shows the arrangement for a LHD car it seems.
The ignition coil lies horizontal, underneath the battery and brake booster mounting. It is mounted in a strap which is bolted to the fire wall (as shown in the parts catalogue - the small drawing on the right, second from the top - but then the other way round).
Routing of the horn wire: from where it comes out of the steering box it runs up the front wall (on the right hand side of the radiator, behind the expansion bottle - not shown in the pic), then along the top of the radiator (together with some other wires) to the left hand side of the radiator, and from there down again and through an opening in the front wall, where it is connected to one of the terminals of the horn. The other horn terminal is connected to the fuse box (switched 12 volt). In other words, the one terminal of the horn carries 12 volt all the time, whenever the ignition switch is on. Actuating the horn switch completes the circuit to earth.
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