Brand New 7290 U-Joint Failure

Was having fun with the 69 Dart tonight. Did a launch at 4000 and power shifted to second at 6500 (4 speed). The rear 7290 let go and tore up the flange of the drive shaft. I have 255/60-15 drag radials running on 3:23 gears 489 case. I estimate the mtr is 425 to 450 on the power. Solid lifter Lunati cam and ported X heads, Air Gap and 750 Holley I built. I am having a new pumpkin set up this week a set of 3:91s and will be ordering a new drive shaft. Anyone have any thoughts on what happened and who is good in the drive shaft business. Never had this happen before.
Thanks FABO