Any issues w/ mini-starter and different torque converters

yup....sounds correct on the date. I couldnt figure out why I broke 2 flex plates on a mild 340/904 but that was it. They would crack all 4 ears and eventually throw a piece out with enough force to scare the crap out of you, but would continue to drive the trans because the other 3 ears had no where to go as they were still an "interference" fit between the convertor and the crank. You remove the convertor bolt and the piece would fall out.