Just move the passenger's side mount bracket back to the same position as the driver's side. V8's and 250 6 cylinders use the same bracket, they're just offset on the frame rails for the 292. There's no need to use some fancy aftermarket mounting bracket unless the butcher job on the frame has made the stock mounts a moot point.
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!