727?

"the lower starter you speak of is on a100 pickups that had a small block 727 with an adapter plate or the pickups with the heavy duty 4 speed"

Thanks for that information. I have a 904 behind my supercharged 360 Magnum (445 rwhp) and it works very well... never complains.

My transmission guy, a race tranny/converter builder for 30 years, told me that a well-built 904 should handle 700 HP nicely... and that the problem with 727's in that the internal rotating parts are so heavy that the transmission (when subjected to high rpm operation/shifting,) literally tears itself up with all the starting and stopping of the rotating parts; it's not the power going through it that causes them to fail... this from a guy who makes his living building them.

Just my 2-cents...