Did you say 70 Charger?
I'm looking to change the seats in my 70 as well. I'm thinking something more like from a late Challenger though. Seats from 4 door or 2 seater cars dont always tip forward much since they were not designed for REAR seat access. You might be able to slide the seat forward enough for rear seat access though.
As far as fabbing brackets, Not a big deal if you have the 3 tools I use: Sawzall, welder and grinder.
I put IROC Z28 seats in the FrankenDuster because they had built in headrests and they reclined. I had to modify the mounts, but in the end, they looked close to stock 73-76 A body bucket seats.