I got a 73 Cuda and I'm looking at the same, I know mine will rest on the floor just to get head room. E-bodys don't have much height as the b-bodys (I think 2" less). Even my Duster seats are bolted directly to the floor, (poly type) just to get my head under the roll bar (6-1)
Been toying with some mounts but I like the looks of the side mounts shown above.
Remember, seats need to be attached adequately but it's the seat belts that holds you and the seat in place in the event of a wreck.