Have you ever seen the twin-engine Cozy the brothers in
Argentina built using two Suzuki car engines? The engines are installed
in a Siamese configuration. I read that they actually had an engine
failure over open water while on one trip back from Oshkosh, reportedly caused
by an ignition failure. They were able to continue flying and safely
landed with only one engine. As I recall, it used twin counter-rotating
props driven by cog-belts. They could shut off either engine and run on
the other engine for economy. It may be possible to do the same thing
using two 13B engines. For weight reasons you would likely need to use
the Racing Beat aluminum end housings.
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Somebody did a great
article on their trips several years ago. Here is an url that I do not know if
it covers it all. Sorry about that.