If a driveshaft vibration is being caused by a pinion angle issue, much of the time it will present itself as a shudder typically at lower speeds between 15-30 mph and will reduce, or even completely eliminate after that. It will typically only be felt under a certain amount of load.
If the vibration increases with speed (not necessarily rpm) it's more indicative of a balance issue. You'd want to look at the shaft as well as the wheels and tires for an out of balance situation. On these cars, even with a stock type steel shaft, there's just not enough mass involved to create big vibrations from the shaft alone.
If the vibration is RPM dependent where you can replicate it with the car sitting still, this indicates an out of balance situation with the engine, clutch, pressure plate, flywheel or even possibly something in the transmission.
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-Jason
1969 Pontiac Firebird
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