Yet another option: Grab a used 904/360 converter, even if it's NFG. Flexplate will only bolt on one way. Using the flexplate laid in place on the donor converter, mark location of weights. Measure carefully. Knock weights off of donor converter. Place your converter face down on a bucket, line up your marked flexplate, and using your measurements you now know where the weights need to be. Weld 'em on! Kinda meatball surgery, but I had a friend with a 360/904 70 Dart that was done this way, and it went 75,000 miles without a problem. Too many donuts, burn outs, and brake torquing finally killed the 904. We did a second converter for a junkyard trans so he could sell the car. Next owner ran it a year and totalled it.