727 question?

The weights on the outside of the converter simply balance the converter "neutral" like tire/rim wheel weights. The weights on the front of the ring gear are "engine" balance weights. B & M makes a flex plate for the 360 which will allow you to run a neutral balance converter. Its a good purchase and SFI approved. [summit or jegs]
The Demon shown is a 360, with a 904 and the B & M flex plate. Look closley, a young lady drives this car for our High School. She is the current HS drags "Champion" The rules state, no car may run faster than 12.00....so she starts off in second gear..thats right, second gear. To present she has [durning TNT] run 11.83 @ 114! She is also a former "junior dragster champ!] She is cool as ice behind the wheel! A darn good driver!