You're right, that's a 904. Learned something new today, thanks, wish I could do that more often. I'm not the guy to give you 904 advice (I've only rebuilt one), but I've done pretty much what you're talking about with 727s several times. The valve bodies are a little different (the '65 has room inside for one more shift of the manual valve), but I believe you can use a '65 in a pushbutton application, just not the other way around.
