Well, thought I'd do a bit of measuring and see what shakes out.
The top (small end) of the location point measures 53/64" on my analog caliper. The large (lower) is 66/64" and over 116/64s and using the calculator I found here:
http://www.magafor.com/841/uk.htm
I get pretty close to a 7 degree taper. [6.93 degrees]
Guess I'll be buying the Pinto shafts!
Cheers - Jim