904 or 727 ????

if i stick with the 904 with the 360 does any one know what flex plate part number or converter to usewith the 360 ????

You can get converters that are already balanced for 360, or you can get the balanced flexplate and use any non externally balanced converter.
I would use the balanced plate so I could use any number of converters.
Easy to look up on Jegs or Summit.