If the only flex point is at that front section and everything else is rigid mounted to the frame I think its still going to break/shear one of the mounts off near the tailpipe. These are long cars and since he's running the pipes all the way out the back, you'd want to dampen the pipes along the way with rubber or even better, urethane. Will create less vibration throughout the cabin as well as allow the tail sections the ability to move around a little as the car is running. Just my 2 cents ...
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1964 Chevrolet Biscayne
409 4-speed
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