A actual 33-34 rearend didn't have a split clamshell. It was one piece and not removable from the torquetube. But if you are running a later rear, the later split clamshell will fit right on this mount.
Doesn't the A rearend have a clamshell with 6 mounting bolts? Set the front bell of the torquetube up to the '32 inner clam and see if it has the same shape (I bet it does). If so, you could probably cut the stock A 6-bolt clamshell off and use a '36-48 split clamshell to hold the A rear to the '32 mount. Before you do all this, you might want to do some measuring or mock-up to be sure the stock length A rearend will position the V8 engine and trans in the correct location to your firewall and radiator. If they are not a good fit, it might be wise to position the engine first, then work your way back. Might end up shortening a V8 rear and torquetube to fit, instead of shortening the A. This will give you a better rearend anyway.
With a '31 rear you do indeed need a clamshell from '32-48...inner shape is fine, but the A bolt holes are all wrong.
For using the A shaft, you just use it as the ground zero that sets the location of everything else... Have rear in place in chassis, put in the part at top of front spring U-bolts that has hole for handcrank, and lower in your engine/tran and bolt to Ujoint stuff for your mockup. You want the Ujoint hookup to be at same height in relation to frame rails as stock, so measure that right now while it's together. Get that height located, put front of engine so center of crank pulley is at right level to accept handcrank through that hole, and that's your axis mundi for the car. Put on stock radiator or approximate its location to be sure you have not made something unworkable, think about where your firewall will be and what minor trimming might be needed. If everything seems do-able, put in engine mounts (like Hurst A-28's?) to support engine mounts at right altitude.
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