Drum Spindle Vs Disc Spindle?

is there any way to tell them apart? if so, how?

my dad is not sure if he has the drum spindles on his cuda, or the disc spindles.

we cant go by what brakes are on it, seeing as its a wilwood kit from the 80's.

he had to have the hub machined down, but the spindle is still good, but we are missing the calipers, so im most likely going to have to buy a new front kit from jegs or summit, and i need to know if it has the drum spindle, or the disc spindle.

any help would be appreciated!