A little pricing help on 4 speed stuff

Sorry if this ? Is in the wrong place. I just bought a 75 dodge dart sport it has the slant 6 a-833 4spd overdrive transmission. I want to sell all this 4 speed stuff it runs and drives with no grinds. I want to sell it all pedals to driveshaft. I will even cut the hump out of the floor but what is it worth? I see theese 4 speeds price from 200$ to 750$. And i haven't clue what it's worth can any one help with a ballpark figure.