Stupid question for the day

I have a magnum 360 I'm trying to find a flex plate for. (It's a crate motor). i am putting on efi and need the flex plate to have the crank signal on the flex plate. Does anybody know if the stock OEM flex plate from a truck will fit to a 904? I was looking up some stuff today and the flex plates are listed specifically for 904 or 727. I wouldn't think the trans would matter so much as the crank bolt pattern and the converter bolt location. Your thoughts please....