What’s a 1963 Plymouth Valore push putting 6 cylinder transmission worth

If the push button shifter and both cables are intact, they are worth as much or more than the transmission. Push button cables are different than column or floor shift cables if you advertise them and have inquiries. A slant six 904, especially one with a ball and trunnion flange on it is about like a 7 1/4 rearend.....you're lucky if you can give them away to anyone but the scrap yard.