The only small block 904 V-8 pushbutton is 1964 only. A 1965 can be made to work by using the 64 valve body. And you will need the crank adapter if the SB is 68 or later.
I will be ordering the adapter from you tomorrow so that way I have it on the shelf. I know there was a small block push button 904 in the 64 and 65 darts but I know other mopars had to have them as well. I'm honestly surprised that there isn't someone that makes a conversion kit for the /6 904.