B&m flexplate 10236 for 904?

So there is the difference, the 10239 is listed for the 904 because it is only drilled for the small converter, the one you have, 10236, is listed for the 727 because it works with both large and small converters and like I said my stock 360/727 had a large converter. I don't know why they wouldn't say the 10236 works with the 904 in the description, and for some reason the more universal 10236 is actually a few less $$. Maybe there is a starter issue sometimes, you can always mock it up on transmission before bolting it to the motor and even put the starter in and see if it clears everything.