Paul,

Here are a couple of shots of my ignition control box.  i don't know much
about it except that it has 4 "Blocks" mounted to heat sinks
with separate fans, a set of relays to switch between the sides - A and B.
 There is another box with toggle switches that allows switching leading
and trailing from A to B individually.

Randy

It is a mystery to me. Remind me to scope the wires going to
the ignition coils when you bring it over to run it up.

Paul Lamar