No and this right here is the problem. You can not measure degrees off plumb with a canted instrument. The instrument MUST be plumb in the dimension opposite what you are trying to measure
So far as the tail bushing, I doubt there would be anywhere near that much difference., although there certainly could/ will be some
Also possible the balancer flange may be a bit "wobbly" You might wrench the engine 1/4 turn at a time and take readings.
