N8dawg,
Obviously a 292 crank is longer than most any V8. So its natural frequency for destructive harmonics is at lower rpm than the shorter crank. The torsionals are higher at lower rpms also. I'd use a Fluidampr myself. It would also help reducing torsionals transmitted to the valve train. A large one for a Chev V8 might be bore modified to fit if one isn't available for 292. David