A lot of them were used as stationary engines to run pumps, etc. in the oilfields. Somebody had several for sale recently. They're basically two 351's on a common crankcase and crankshaft- - - -4 cylinder heads, two distributors, two carbs & intakes, etc.
Jerry

"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!