4 Speed Hump fitment?

Yes and no. Went through this with a '66 Valiant. You have to do a bunch of cutting and fitting to the hump and when you are done you have to get creative with the floor. Do yourself a favor and get a hump for an early A. Brewer's makes a fiberglass version that works just fine and you can sell the Duster hump for enough to more than pay for it.