904 with 6.1L SRT Hemi ???

Are you staying stock with the 6.1 or going to mod it? From a torque standpoint you can about compair the 6.1 with a 440 they pull a strong flat torque curve. So I'd try the 904 and if it burns up go 727, my guess is you will have to have a decently built 727 to take it. One of my 392/6.1 customers with a ram truck toasted a few TCI 727's before he put about 3K in parts into one and that held up. But that was in a 5300 lb truck so a light A body won't be near as tough on the tranny. I'd expect you smoke the 904 though, particularly if you put a cam or heads on it.