If I had a 727 I would use it. Did anyone ever see a 904 behind a 426 hemi? Of course not, they are not strong enough STOCK! I know they wont fit. Why has Mopar not made them fit? Not as strong as a 727 Tq Flite. IMO the only weak assembly on the 727 is the sprang. Had a 727 behnd my 426 wedge, NEVER had a issue with it.