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Assuming a 73 uses the same length shaft as a 70-71, it should be 43.60" for a BB with 8 3/4" rear-end. Measured from the center of the u-joints.

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Correct, the Cuda's WB is the same thru the years, as is K frame/engine position ......... I've seen dems listed also as 43.625 ......I measured twice with a tape measure and got 43.750,....an 1/8" difference, could be a "production tolerance"?....either way, as long as you have at least 1" of play when the suspenion squats you won't slam the the yoke in the tailshaft of the tranny

Mike