Small Block Advice

I changed my k member in my duster when I converted to a V8. It was a lot of work but nothing too hard. It would be easier to change the motor mounts.
I was at our local dragstrip last weekend and a guy showed me how he used a 70's dodge truck mount (the metal part that bolts to the engine) on the passenger side and the standard v8 mount on the drivers side and it looked like a perfect fit. His car was a 68 dart.
Just something to look into.