727 or 904

I like the 904 (actually 998/999) Always keep a spare around though. Reverse patt manual valvebody helps. 5 cluthes etc.... Easy to rebuild too....Light weight also.
cheap too...I paid $45 for one out of a low milage car at a swap meet, the 727 next to it was $220. 904's need some help to stay together but nothing drastic for any type of street use. IMHO