Not sure, myself.
I've heard about the ADC motors, of course, in terms of their performance as traction motors for EV's. Got some datasheets...
Not sure what would happen if you change half of it... if the rest can still do something.
What can you say about the wiring in the stator? How many teeth, what do the coils look like, gauge of wire, etc.
There are some basic electrical parameters (poles, coils, connection groups, etc.) that you need to know about before you start otherwise you'll get "lots of nothing".
Just for starters, the field polarity on the DC motor's rotor is flipped many times per rotation. Just count the bars on the commutator.... Now consider the number of brushes on it... so that means how many poles...?