Length of 904 transmission in 1965 Barracuda

They will fit but you will need slip yolk drive shaft and you will have a issue with the shifter set up the 65 is dual cable set up and your 66 up trans changed over to a rod style linkage and the shifter throws are totally different.
Trust me I am still fighting my conversion , 65 to 72 trans.
The cable conversion kits are not cutting it, cables are junk, trying to convert to a b&m cable now but what a bunch of work.
May need to go to a after market shifter for later style trans.
Lon