Pure Magnum swap
Here's a picture of my torque converter with the bolt hole marked for the elongated flex plate bolt hole. Can you rotated the flex plate around so that three of the holes match? Seems I had to match up the three and then do the modification on the fourth hole. I don't have pictures of the flex plate mounted, sorry.
Also, you can see the notch that you have to grind in the bellhousing for the CPS.