The A833 will only bolt up to a '64-65 slant bell specifically made for the A833.
All other slant bells are 3 speed only until the OD 833 came out. Those bells can work but the bearing retainer is too large for the A833. You can make a spacer ring to adapt the A833 to the OD bell. This...
I built a 225 shot peened crank truck motor with a .125 milled off block and head combined. 9.5 compression. Runs on 93 perfectly. Manley pro flow valves, .464 cam 276* 340 springs
Ported head, lightened and balanced crank by 20 lbs. Originally 87lbs
Had to bore 60 over , room for more believe...
I have a set from my 340S with your #1 preferred casting numbers.
They have around 80,000 miles on them. Headers were put on the car in the early 80s
Let me know if you still need them.
I'm on the east coast and will ship them
I live just over the border in New Hampshire.
I have tried contacting you through Slant Six Forum as well.
I am on vacation for Thanksgiving and can come down and check everything out.
If all is good I will take the good and the bad.
Let me know. Gary