manual to auto swap what will work?

I assume you want to swap the auto trans from the volare into the 65 with the slant six ?

The pilot hole in the old motor's crank is likely to be too small to fit the hub on the later torque converter. You will need a torque converter with a smaller hub. Mopar changed the size of these sometime in the mid to late 60's on small v8 and six applications.

Then you need to consider how you are going to shift the trans. Is your manual set up floor or column shifted ?

If its on the floor I'd put a cable ratchet shifter in and mount it on the floor.

If your car is column shifted then you need to decide if you want to convert to floor or retain column shifting.

If column then I would try and locate a 66 A body shifter set up column brackets linkages - the works. You also need the kickdown set up from the donor car.

The 66's used a conventional column shift, 65's used the pushbutton.

If your car is column shifted and you want to make it floor shifted then you need a plain column that is correct for your steering box (manual or power) and either a cable shifter or the original style floor shift from a 66 a body with the console and brackets etc, again you need everything from the donor car for this swap.

If it were me, I'd wait until you are ready to swap the v8 in, and in the meantime collect all the parts you want for the auto conversion using the correct parts, based on your preferences, and do it all at once, less pain... My.02.