anyone know the taper on C6 Vette ball joints?

[byndbad914]

as the titles states, I am hoping someone knows the taper on the ball joints for C6s...

I have uppers in the used spindles I got but they don't measure to what I consider a "normal" GM taper. The lower reamed taper in the spindle measures out the same but I am hoping to confirm the angle since, again, it is not what I expected.