Keith, is it possible to run a 904 behind a 360 (or cast crank 340) by just using the B&M offset flexplate?? I was thinking about doing this and it seems the OP may run into this also!! Geof
I don't think the plate is offset, it just is weighted differently so you don't have to swap torque converters, if you use the plate you can use a internal balanced converter on a cast/external crank. If you run the 360 and 360 converter you don't need the plate.