The B-body bench seats should fit but they're completely different in appearance. The b-body seats are a square top with headrests. The e-body version has high back seat backs very similar to the bucket seats. From the outside of the car, you would think that it had bucket seats.
I would like to use the late b-body bench seat version of the Pistol grip shifter and was told that it would not clear the e-body bench seat due to the seat being too far forward. I'll definitley mock it up before cutting on my new seat covers.
I've been trying to add pics but I keep being told that the "upload folder is full".