Can anybody tell me the number of splines on the driveshaft? Is it a multiple of 3? If not, then there is only one way that the yoke holes can line up, and mine is correct. But if it is a multiple of three then I need to try one or two of the other positions.

Got spline count from junkyard car, it's 27. So there are 3 positions where the flex disc fingers can align. I saw a photo of some marks on the u-joint yoke, so I'll see if one of the three positions line up the yoke with a shaft mark I found.