Bellhousing question--will it work?

I have a 1966 Valiant with the slant and 3spd manual. I'm going to put in a hump, and get rid of the column shiftyness (I made that word. I think.) Question I have is this...I have an a-body 4-speed lying here, with a shifter and linkage. Will it bolt to the slant 3-spd bellhousing? I know some of the later bellhousings had multiple bolt patterns for the transmission. This is a 69 4-spd, btw, so I know I don't have to worry about the big retainer like whats on the OD units. Anyone know what the spline count is on the 3spd? I would like to swap this trans, but I don't want to take the 3spd out if its not going to work. Thanks for any help!!