Well I was able to decode the flywheel via the casting number. The 29-57 Master Parts book says that 839754 is for a 42-53 3/4, 1 TON UTIL, or Pass 1/2 TON (hvy duty clutch).
Whats cool is that the heavy duty clutch specifically lists 9 bolt holes vs 6.
So... now off to find a heavy duty clutch kit.
