727 Trans to 1995 360 Bolt?

The flexplate(stock Magnum),has one slightly off center bolt hole. You need to elongate that hole to start. Do that 1st. Do you have a stock 727 converter,or aftermarket? My aftermarket one ,takes 3/8" coarse. I.I.R.C.,stock 727 converter the same. Maybe someone,will chime in.
Matters ,if it's a 360 or 318 converter..The early Magnum flex plates,are balancedwith weights on it.(like a 360la). If the torque converter 360,be sure to knock the weights off of it.(neutral balance)