904 has a whole lot less rotating mass - better match for the 318
I believe the 727 uses the same yoke as the 833 - driveshaft length is probably different. Not too hard to find a 904 driveshaft yoke.
so what is te difference between the two? are they both 3 spds? the 318 is built, i will occassionally get on it but the car is mostly for cruising. does anybody make a 4 spd automatic (overdrive)?