904 to 727

I have a 66 Barracuda with small block and 904 transmission and a friend of mine has been trying to sell me a 727 recently rebuilt with manual valve body . Anyone every done this I know I would need a driveshaft from a 727 to a 7 1/4 rearend later to be change to a 8 3/4 would I be able to hook up column linkage or need to go to floor mounted shifter . Someone told me the 727 wouldn't fit the floor pan and might have to redo floor. . Or if someone knows of a 904 with manual valve body that I could get a stall converter for trying to get rid of linkage Thanks