4 speed question on my 66 Valiant

Hi Guys, I have been thinking I want a 4 speed in my Valiant. I have a 727 in it now with a BNM slap shifter. I have a built 318 with a Ford 9 inch rear with posi. My question is what tranny do I want and what kind of money am I looking at to do the swap if I decide to go that way.
Thanks,
Paul