Is this what u are talking about? I bought this several yrs ago for my 55 Nomad, Ended up going with a 605 Gearbox.................
This came off a early 60's Impala that i found in the Junkyard.
Thanks, Rick
P.S.
Also concerning your other post about the Clutch pivot, When i was at Yard last week getting the Dually Rims for my 72 Wrecker. I saw a 67 C40 that had a 6 & it had a bracket mounted to side of motor with the Ball pressed on it, Would u like me to get a pic of it next time Im at Yard?